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🌟 NEW: Customizable Macrocyclic Peptide Libraries

Heterocyclic Building Blocks

3723
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  • Kojic acid

    Purity:
    ≥ 99% (Assay)
    Synonym:
    2-Hydroxymethyl-5-hydroxy-1,4-pyrone
    Catalog Number:
    21857
    CAS Number:
    501-30-4
    Purity Limit:
    ≥ 99% (Assay)
    MDL NO:
    MFCD00006580
    Molecular Formula:
    C6H6O4
    Molecular Weight:
    142.11
    Specification Sheet SDS

  • 7-Hydroxy-4-methylcoumarin

    Purity:
    ≥ 95% (Assay)
    Synonym:
    4-Methyl-7-hydroxycoumarin
    Catalog Number:
    21860
    CAS Number:
    90-33-5
    Purity Limit:
    ≥ 95% (Assay)
    MDL NO:
    MFCD00006866
    Molecular Formula:
    C10H8O3
    Molecular Weight:
    176.17
    Specification Sheet SDS

  • 4-Hydroxyindole

    Purity:
    ≥ 98% (Assay)
    Synonym:
    1H-Indol-4-ol
    Catalog Number:
    21841
    CAS Number:
    2380-94-1
    Purity Limit:
    ≥ 98% (Assay)
    MDL NO:
    MFCD00005667
    Molecular Formula:
    C8H7NO
    Molecular Weight:
    133.15
    Specification Sheet SDS

  • 2,3-Pyrazinedicarboxylic acid

    Purity:
    ≥ 99% (HPLC)
    Synonym:
    Pyrazine-2,3-dicarboxylic acid
    Catalog Number:
    21247
    CAS Number:
    89-01-0
    Purity Limit:
    ≥ 99% (HPLC)
    MDL NO:
    MFCD00006131
    Molecular Formula:
    C6H4N2O4
    Molecular Weight:
    168.11
    Specification Sheet SDS

  • 3,3'-Diindolylmethane

    Purity:
    ≥ 98% (Assay)
    Synonym:
    3-(1H-Indol-3-ylmethyl)-1H-indole
    Catalog Number:
    21231
    CAS Number:
    1968-05-4
    Purity Limit:
    ≥ 98% (Assay)
    MDL NO:
    MFCD00195766
    Molecular Formula:
    C17H14N2
    Molecular Weight:
    246.31
    Specification Sheet SDS

  • 3-Acetoxy-5-bromoindole

    Purity:
    ≥ 98% (HPLC)
    Synonym:
    5-Bromo-1H-indol-3-yl acetate
    Catalog Number:
    21203
    CAS Number:
    17357-14-1
    Purity Limit:
    ≥ 98% (HPLC)
    MDL NO:
    MFCD00037933
    Molecular Formula:
    C10H8BrNO2
    Molecular Weight:
    254.08
    Specification Sheet SDS

  • 5-Methoxy-2-methylindole

    Purity:
    ≥ 98% (HPLC)
    Synonym:
    5-Methoxy-2-methyl-1H-indole
    Catalog Number:
    21176
    CAS Number:
    1076-74-0
    Purity Limit:
    ≥ 98% (HPLC)
    MDL NO:
    MFCD00005620
    Molecular Formula:
    C10H11NO
    Molecular Weight:
    161.2
    Specification Sheet SDS

  • 1,3-Dimethyl-2-imidazolidinone

    Purity:
    ≥ 99% (GC)
    Synonym:
    N,N'-Dimethyl-ethylene-urea
    Catalog Number:
    12724
    CAS Number:
    80-73-9
    Purity Limit:
    ≥ 99% (GC)
    MDL NO:
    MFCD00003188
    Molecular Formula:
    C5H10N2O
    Molecular Weight:
    114.15
    Specification Sheet SDS

  • 1-Phenylpiperazine

    Hazmat
    Purity:
    ≥ 98% (Assay)
    Synonym:
    N-Phenylpiperazine
    Hazmat
    Catalog Number:
    06901
    CAS Number:
    92-54-6
    Purity Limit:
    ≥ 98% (Assay)
    MDL NO:
    MFCD00005957
    Molecular Formula:
    C10H14N2
    Molecular Weight:
    162.24
    Specification Sheet SDS

  • 1H-Pyrazole

    Purity:
    ≥ 98% (GC)
    Synonym:
    1,2-Diazole
    Catalog Number:
    02354
    CAS Number:
    288-13-1
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD00005234
    Molecular Formula:
    C3H4N2
    Molecular Weight:
    68.08
    Specification Sheet SDS

  • 2-Imidazolidone

    Purity:
    ≥ 99% (HPLC)
    Synonym:
    N,N'-Ethyleneurea
    Catalog Number:
    01974
    CAS Number:
    120-93-4
    Purity Limit:
    ≥ 99% (HPLC)
    MDL NO:
    MFCD00005257
    Molecular Formula:
    C3H6N2O
    Molecular Weight:
    86.09
    Specification Sheet SDS

  • 1H-1,2,4-Triazole

    Purity:
    ≥ 99% (HPLC)
    Synonym:
    Pyrrodiazole
    Catalog Number:
    00942
    CAS Number:
    288-88-0
    Purity Limit:
    ≥ 99% (HPLC)
    MDL NO:
    MFCD00005228
    Molecular Formula:
    C2H3N3
    Molecular Weight:
    69.07
    Specification Sheet SDS

  • 4-Aminoantipyrine

    Grade:
    ACS reagent
    Purity:
    ≥ 98% (Assay by titration)
    Synonym:
    4-Amino-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one
    Catalog Number:
    00417
    Grade:
    ACS reagent
    CAS Number:
    83-07-8
    Purity Limit:
    ≥ 98% (Assay by titration)
    MDL NO:
    MFCD00003145
    Molecular Formula:
    C11H13N3O
    Molecular Weight:
    203.25
    Specification Sheet SDS

  • Guanine

    Purity:
    ≥ 98% (Assay)
    Synonym:
    2-Amino-6-hydroxypurine
    Catalog Number:
    00388
    CAS Number:
    73-40-5
    Purity Limit:
    ≥ 98% (Assay)
    MDL NO:
    MFCD00071533
    Molecular Formula:
    C5H5N5O
    Molecular Weight:
    151.13
    Specification Sheet SDS

  • 4-Methylumbelliferone sodium salt

    Purity:
    ≥ 98% (HPLC)
    Synonym:
    7-Hydroxy-4-methylcoumarin
    Catalog Number:
    49326
    CAS Number:
    5980-33-6
    Purity Limit:
    ≥ 98% (HPLC)
    MDL NO:
    MFCD00069856
    Molecular Formula:
    C10H7NaO3
    Molecular Weight:
    198.15
    Specification Sheet SDS

  • 3-Aminopyridine

    Hazmat
    Purity:
    ≥ 99% (GC)
    Synonym:
    3-Pyridinamine
    Hazmat
    Catalog Number:
    49318
    CAS Number:
    462-08-8
    Purity Limit:
    ≥ 99% (GC)
    MDL NO:
    MFCD00006400
    Molecular Formula:
    C5H6N2
    Molecular Weight:
    94.11
    Specification Sheet

  • 3-Hydroxybenzoic acid

    Purity:
    ≥ 98% (GC)
    Synonym:
    m-Salicylic acid
    Catalog Number:
    49319
    CAS Number:
    99-06-9
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD00002506
    Molecular Formula:
    C7H6O3
    Molecular Weight:
    138.12
    Specification Sheet SDS

  • 2-Cyanopyridine

    Purity:
    ≥ 99% (GC)
    Synonym:
    2-Pyridinecarbonitrile
    Catalog Number:
    46569
    CAS Number:
    100-70-9
    Purity Limit:
    ≥ 99% (GC)
    MDL NO:
    MFCD00006218
    Molecular Formula:
    C6H4N2
    Molecular Weight:
    104.11
    SDS

  • Methyl 3-bromothiophene-2-carboxylate

    Purity:
    ≥ 98% (GC)
    Synonym:
    3-Bromothiophene-2-carboxylic acid methyl ester
    Catalog Number:
    45009
    CAS Number:
    26137-08-6
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD00173839
    Molecular Formula:
    C6H5BrO2S
    Molecular Weight:
    221.07
    Specification Sheet SDS

  • 2-Amino-4-chloro-5-formyl-3-thiophenecarbonitrile

    Hazmat
    Purity:
    ≥ 98% (GC)
    Synonym:
    2-Amino-4-chloro-3-cyano-5-formylthiophene
    Hazmat
    Catalog Number:
    45007
    CAS Number:
    104366-23-6
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD03788265
    Molecular Formula:
    C6H3ClN2OS
    Molecular Weight:
    186.61
    Specification Sheet SDS

  • 2,5-Diiodothiophene

    Purity:
    ≥ 97% (GC)
    Catalog Number:
    45018
    CAS Number:
    625-88-7
    Purity Limit:
    ≥ 97% (GC)
    MDL NO:
    MFCD00014525
    Molecular Formula:
    C4H2I2S
    Molecular Weight:
    335.93
    Specification Sheet SDS

  • Methyl 5-chlorothiophene-2-carboxylate

    Purity:
    ≥ 98% (GC)
    Synonym:
    5-Chlorothiophene-2-carboxylic acid methyl ester
    Catalog Number:
    45019
    CAS Number:
    35475-03-7
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD06203698
    Molecular Formula:
    C6H5ClO2S
    Molecular Weight:
    176.61
    Specification Sheet SDS

  • 4,6-Dichloro-1,3,5-triazin-2-amine

    Purity:
    ≥ 95% (HPLC)
    Synonym:
    2-Amino-4,6-dichloro-1,3,5-triazine
    Catalog Number:
    45041
    CAS Number:
    933-20-0
    Purity Limit:
    ≥ 95% (HPLC)
    MDL NO:
    MFCD00078331
    Molecular Formula:
    C3H2Cl2N4
    Molecular Weight:
    164.98
    Specification Sheet SDS

  • 3-Acetyl-2-(aminosulfonyl)-5-chlorothiophene

    Purity:
    ≥ 98% (HPLC)
    Synonym:
    3-Acetyl-5-chloro-2-thiophenesulfonamide
    Catalog Number:
    45004
    CAS Number:
    160982-10-5
    Purity Limit:
    ≥ 98% (HPLC)
    MDL NO:
    MFCD09033309
    Molecular Formula:
    C6H6ClNO3S2
    Molecular Weight:
    239.69
    Specification Sheet SDS

  • 3,4-Dichlorothiophene 1,1-dioxide

    Purity:
    ≥ 96% (GC)
    Catalog Number:
    45021
    CAS Number:
    52819-14-4
    Purity Limit:
    ≥ 96% (GC)
    MDL NO:
    MFCD00187130
    Molecular Formula:
    C4H2Cl2O2S
    Molecular Weight:
    185.02
    Specification Sheet SDS

  • tert-Butyl (4-bromothiophen-2-yl)carbamate

    Purity:
    ≥ 98% (HPLC)
    Synonym:
    tert-Butyl (4-Bromo-2-thienyl)carbamate
    Catalog Number:
    45026
    CAS Number:
    868387-45-5
    Purity Limit:
    ≥ 98% (HPLC)
    MDL NO:
    MFCD13195314
    Molecular Formula:
    C9H12BrNO2S
    Molecular Weight:
    278.16
    Specification Sheet SDS

  • 2-Chloro-3-methylthiophene

    Purity:
    ≥ 98% (GC)
    Catalog Number:
    45010
    CAS Number:
    14345-97-2
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD00130083
    Molecular Formula:
    C5H5ClS
    Molecular Weight:
    132.61
    Specification Sheet SDS

  • 2,5-Dibromo-3,4-dinitrothiophene

    Purity:
    ≥ 99% (GC)
    Catalog Number:
    45015
    CAS Number:
    52431-30-8
    Purity Limit:
    ≥ 99% (GC)
    MDL NO:
    MFCD00015537
    Molecular Formula:
    C4Br2N2O4S
    Molecular Weight:
    331.92
    Specification Sheet SDS

  • 2,5-Dibromothiophene

    Purity:
    ≥ 99% (GC)
    Catalog Number:
    45024
    CAS Number:
    3141-27-3
    Purity Limit:
    ≥ 99% (GC)
    MDL NO:
    MFCD00005420
    Molecular Formula:
    C4H2Br2S
    Molecular Weight:
    241.93
    Specification Sheet SDS

  • 2-Methyl-4,6-bis(trichloromethyl)-1,3,5-triazine

    Purity:
    ≥ 98% (GC)
    Catalog Number:
    45037
    CAS Number:
    949-42-8
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD00023178
    Molecular Formula:
    C6H3Cl6N3
    Molecular Weight:
    329.81
    Specification Sheet SDS

  • 2,4-Dichloro-6-phenyl-1,3,5-triazine

    Purity:
    ≥ 98% (GC)
    Catalog Number:
    45040
    CAS Number:
    1700-02-3
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD00047340
    Molecular Formula:
    C9H5Cl2N3
    Molecular Weight:
    226.06
    Specification Sheet SDS

  • 2-(4-Bromophenyl)-4,6-diphenylpyrimidine

    Purity:
    ≥ 98% (HPLC)
    Catalog Number:
    45030
    CAS Number:
    457613-56-8
    Purity Limit:
    ≥ 98% (HPLC)
    MDL NO:
    MFCD29477690
    Molecular Formula:
    C22H15BrN2
    Molecular Weight:
    387.28
    Specification Sheet SDS

  • 3-Chloro-1,2,4-triazole

    Purity:
    ≥ 99% (HPLC)
    Catalog Number:
    45043
    CAS Number:
    6818-99-1
    Purity Limit:
    ≥ 99% (HPLC)
    MDL NO:
    MFCD00128812
    Molecular Formula:
    C2H2ClN3
    Molecular Weight:
    103.51
    Specification Sheet SDS

  • 2,5-Dichloro-3-methylthiophene

    Purity:
    ≥ 96% (GC)
    Catalog Number:
    45014
    CAS Number:
    17249-90-0
    Purity Limit:
    ≥ 96% (GC)
    MDL NO:
    MFCD00022490
    Molecular Formula:
    C5H4Cl2S
    Molecular Weight:
    167.05
    Specification Sheet SDS

  • 5-Chlorothiophene-2-carboxaldehyde

    Purity:
    ≥ 95% (GC)
    Synonym:
    2-Chloro-5-formylthiophene
    Catalog Number:
    45008
    CAS Number:
    7283-96-7
    Purity Limit:
    ≥ 95% (GC)
    MDL NO:
    MFCD00047090
    Molecular Formula:
    C5H3ClOS
    Molecular Weight:
    146.59
    Specification Sheet SDS

  • Ethyl 5-chlorothiophene-2-carboxylate

    Purity:
    ≥ 98% (GC)
    Synonym:
    5-Chlorothiophene-2-carboxylic acid ethyl ester
    Catalog Number:
    45001
    CAS Number:
    5751-82-6
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD00051732
    Molecular Formula:
    C7H7ClO2S
    Molecular Weight:
    190.64
    Specification Sheet SDS

  • 2-Bromo-5-dodecylthiophene

    Purity:
    ≥ 95% (GC)
    Catalog Number:
    45002
    CAS Number:
    153561-74-1
    Purity Limit:
    ≥ 95% (GC)
    MDL NO:
    MFCD22572689
    Molecular Formula:
    C16H27BrS
    Molecular Weight:
    331.36
    Specification Sheet SDS

  • 2,3,5-Tribromo-4-methylthiophene

    Purity:
    ≥ 97% (GC)
    Catalog Number:
    45023
    CAS Number:
    67869-13-0
    Purity Limit:
    ≥ 97% (GC)
    MDL NO:
    MFCD00130086
    Molecular Formula:
    C5H3Br3S
    Molecular Weight:
    334.85
    Specification Sheet SDS

  • 2-Chloro-5-methylthiophene

    Hazmat
    Purity:
    ≥ 96% (GC)
    Hazmat
    Catalog Number:
    45005
    CAS Number:
    17249-82-0
    Purity Limit:
    ≥ 96% (GC)
    MDL NO:
    MFCD01632145
    Molecular Formula:
    C5H5ClS
    Molecular Weight:
    132.61
    Specification Sheet SDS

  • 2-[3'-Bromo[1,1'-biphenyl]-3-yl]-4,6-diphenyl-1,3,5-triazine

    Purity:
    ≥ 98%
    Catalog Number:
    45031
    CAS Number:
    1606981-69-4
    Purity Limit:
    ≥ 98%
    MDL NO:
    MFCD30730127
    Molecular Formula:
    C27H18BrN3
    Molecular Weight:
    464.37
    Specification Sheet SDS

  • 2,5-Dibromo-3,4-thiophenedicarboxylic anhydride

    Purity:
    ≥ 98% (GC)
    Synonym:
    4,6-Dibromothieno[3,4-c]furan-1,3-dione
    Catalog Number:
    45020
    CAS Number:
    1015423-45-6
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD27923031
    Molecular Formula:
    C6Br2O3S
    Molecular Weight:
    311.93
    Specification Sheet SDS

  • 2-Chloro-4,6-diamino-1,3,5-triazine

    Purity:
    ≥ 95% (HPLC)
    Synonym:
    2,4-Diamino-6-chloro-1,3,5-triazine
    Catalog Number:
    45032
    CAS Number:
    3397-62-4
    Purity Limit:
    ≥ 95% (HPLC)
    MDL NO:
    MFCD00006054
    Molecular Formula:
    C3H4ClN5
    Molecular Weight:
    145.55
    Specification Sheet SDS

  • 2-(3-Carboxyanilino)-4,6-dichloro-1,3,5-triazine

    Purity:
    ≥ 95% (Assay by titration)
    Catalog Number:
    45033
    CAS Number:
    26940-56-7
    Purity Limit:
    ≥ 95% (Assay by titration)
    MDL NO:
    MFCD00059762
    Molecular Formula:
    C10H6Cl2N4O2
    Molecular Weight:
    285.08
    Specification Sheet SDS

  • 2-([1,1'-Biphenyl]-3-yl)-4,6-dichloro-1,3,5-triazine

    Purity:
    ≥ 98% (GC)
    Catalog Number:
    45039
    CAS Number:
    1402225-89-1
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD30543410
    Molecular Formula:
    C15H9Cl2N3
    Molecular Weight:
    302.16
    Specification Sheet SDS

  • 3-Acetyl-2,5-dichlorothiophene

    Purity:
    ≥ 98% (GC)
    Catalog Number:
    45003
    CAS Number:
    36157-40-1
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD00014522
    Molecular Formula:
    C6H4Cl2OS
    Molecular Weight:
    195.06
    Specification Sheet SDS

  • 4,5-Dibromo-1H-1,2,3-triazole

    Purity:
    ≥ 98% (Assay by titration)
    Catalog Number:
    45044
    CAS Number:
    15294-81-2
    Purity Limit:
    ≥ 98% (Assay by titration)
    MDL NO:
    MFCD08062401
    Molecular Formula:
    C2HBr2N3
    Molecular Weight:
    226.86
    Specification Sheet SDS

  • 2,4-Dibromothiophene

    Purity:
    ≥ 90% (GC)
    Catalog Number:
    45025
    CAS Number:
    3140-92-9
    Purity Limit:
    ≥ 90% (GC)
    MDL NO:
    MFCD00043889
    Molecular Formula:
    C4H2Br2S
    Molecular Weight:
    241.93
    Specification Sheet SDS

  • 4,4'-Dibromo-2,2'-bithiophene

    Purity:
    ≥ 98% (GC)
    Catalog Number:
    45013
    CAS Number:
    51285-60-0
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD00508561
    Molecular Formula:
    C8H4Br2S2
    Molecular Weight:
    324.05
    Specification Sheet SDS

  • 3,5-Dibromo-1,2,4-triazole

    Purity:
    ≥ 97% (GC)
    Catalog Number:
    45045
    CAS Number:
    7411-23-6
    Purity Limit:
    ≥ 97% (GC)
    MDL NO:
    MFCD00487260
    Molecular Formula:
    C2HBr2N3
    Molecular Weight:
    226.86
    Specification Sheet SDS

  • 2-Chlorothiophene

    Hazmat
    Purity:
    ≥ 98% (GC)
    Synonym:
    2-Thienyl chloride
    Hazmat
    Catalog Number:
    45016
    CAS Number:
    96-43-5
    Purity Limit:
    ≥ 98% (GC)
    MDL NO:
    MFCD00005421
    Molecular Formula:
    C4H3ClS
    Molecular Weight:
    118.58
    Specification Sheet SDS
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