1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one

C100H110BrF6N21O6 — CID 163509110

IUPAC1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one
SMILES[C-]#[N+]C[C@H]1CN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(Br)c24)C3)CCN1C(=O)C(=C)F.[C-]#[N+]C[C@H]1CN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(C(F)(F)F)c24)C3)CCN1C(=O)C(=C)F.[C-]#[N+]C[C@H]1CN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(C5CC5)c24)C3)CCN1C(=O)C(=C)F
InChIInChI=1S/C35H40FN7O2.C33H35F4N7O2.C32H35BrFN7O2/c1-23(36)34(44)43-18-17-42(20-27(43)19-37-2)33-29-14-16-41(21-30(29)38-35(39-33)45-22-26-9-6-15-40(26)3)31-11-5-8-25-7-4-10-28(32(25)31)24-12-13-24;1-21(34)31(45)44-16-15-43(18-24(44)17-38-2)30-25-12-14-42(19-27(25)39-32(40-30)46-20-23-9-6-13-41(23)3)28-11-5-8-22-7-4-10-26(29(22)28)33(35,36)37;1-21(34)31(42)41-16-15-40(18-24(41)17-35-2)30-25-12-14-39(28-11-5-8-22-7-4-10-26(33)29(22)28)19-27(25)36-32(37-30)43-20-23-9-6-13-38(23)3/h4-5,7-8,10-11,24,26-27H,1,6,9,12-22H2,3H3;4-5,7-8,10-11,23-24H,1,6,9,12-20H2,3H3;4-5,7-8,10-11,23-24H,1,6,9,12-20H2,3H3/t26-,27-;2*23-,24-/m000/s1
InChIKeyDBDKWVQZPVTDBY-BZXDUPFISA-N
MW1896.01 g/mol
LogP14.91
Rot. Bonds22

About 1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one

1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one (PubChem CID 163509110) has the molecular formula C100H110BrF6N21O6 and a molecular weight of 1896.01 g/mol. Its IUPAC name is 1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one.

Molecular Properties

Compound Name1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one
PubChem CID163509110
Molecular FormulaC100H110BrF6N21O6
Molecular Weight1896.01 g/mol
Exact Mass1893.80
IUPAC Name1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one
SMILES[C-]#[N+]C[C@H]1CN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(Br)c24)C3)CCN1C(=O)C(=C)F.[C-]#[N+]C[C@H]1CN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(C(F)(F)F)c24)C3)CCN1C(=O)C(=C)F.[C-]#[N+]C[C@H]1CN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(C5CC5)c24)C3)CCN1C(=O)C(=C)F
InChIInChI=1S/C35H40FN7O2.C33H35F4N7O2.C32H35BrFN7O2/c1-23(36)34(44)43-18-17-42(20-27(43)19-37-2)33-29-14-16-41(21-30(29)38-35(39-33)45-22-26-9-6-15-40(26)3)31-11-5-8-25-7-4-10-28(32(25)31)24-12-13-24;1-21(34)31(45)44-16-15-43(18-24(44)17-38-2)30-25-12-14-42(19-27(25)39-32(40-30)46-20-23-9-6-13-41(23)3)28-11-5-8-22-7-4-10-26(29(22)28)33(35,36)37;1-21(34)31(42)41-16-15-40(18-24(41)17-35-2)30-25-12-14-39(28-11-5-8-22-7-4-10-26(33)29(22)28)19-27(25)36-32(37-30)43-20-23-9-6-13-38(23)3/h4-5,7-8,10-11,24,26-27H,1,6,9,12-22H2,3H3;4-5,7-8,10-11,23-24H,1,6,9,12-20H2,3H3;4-5,7-8,10-11,23-24H,1,6,9,12-20H2,3H3/t26-,27-;2*23-,24-/m000/s1
InChIKeyDBDKWVQZPVTDBY-BZXDUPFISA-N
XLogP14.91
TPSA208.20 Ų
H-Bond Donors
H-Bond Acceptors21
Rotatable Bonds22
Heavy Atoms134
Complexity

Lipinski Rule of Five

3 violations

RuleValue
MW ≤ 5001896.01
LogP ≤ 514.91
H-Bond Donors ≤ 50
H-Bond Acceptors ≤ 1021

Computed Properties (RDKit)

Structural Alerts{'alert_name': 'Carbo_cation/anion', 'substructure': 'N/A'}, {'alert_name': 'Michael_acceptor_1', 'substructure': 'N/A'}

Analyze 1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one with MolForge

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Related Compounds

Frequently Asked Questions

What is the IUPAC name of 1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one?
The IUPAC name of 1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one (CID 163509110) is 1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one.
What is the SMILES notation for 1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one?
The canonical SMILES for 1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one is [C-]#[N+]C[C@H]1CN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(Br)c24)C3)CCN1C(=O)C(=C)F.[C-]#[N+]C[C@H]1CN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(C(F)(F)F)c24)C3)CCN1C(=O)C(=C)F.[C-]#[N+]C[C@H]1CN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(C5CC5)c24)C3)CCN1C(=O)C(=C)F.
What is the InChIKey of 1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one?
The InChIKey is DBDKWVQZPVTDBY-BZXDUPFISA-N. The full InChI is InChI=1S/C35H40FN7O2.C33H35F4N7O2.C32H35BrFN7O2/c1-23(36)34(44)43-18-17-42(20-27(43)19-37-2)33-29-14-16-41(21-30(29)38-35(39-33)45-22-26-9-6-15-40(26)3)31-11-5-8-25-7-4-10-28(32(25)31)24-12-13-24;1-21(34)31(45)44-16-15-43(18-24(44)17-38-2)30-25-12-14-42(19-27(25)39-32(40-30)46-20-23-9-6-13-41(23)3)28-11-5-8-22-7-4-10-26(29(22)28)33(35,36)37;1-21(34)31(42)41-16-15-40(18-24(41)17-35-2)30-25-12-14-39(28-11-5-8-22-7-4-10-26(33)29(22)28)19-27(25)36-32(37-30)43-20-23-9-6-13-38(23)3/h4-5,7-8,10-11,24,26-27H,1,6,9,12-22H2,3H3;4-5,7-8,10-11,23-24H,1,6,9,12-20H2,3H3;4-5,7-8,10-11,23-24H,1,6,9,12-20H2,3H3/t26-,27-;2*23-,24-/m000/s1.
What are the key properties of 1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one?
1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one has a molecular weight of 1896.01 g/mol, XLogP of 14.91, 22 rotatable bonds, 0 hydrogen bond donors, and 21 hydrogen bond acceptors.
Where does this data come from?
All data for 1-[(2R)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;1-[(2R)-4-[7-(8-cyclopropylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-2-(isocyanomethyl)piperazin-1-yl]-2-fluoroprop-2-en-1-one;2-fluoro-1-[(2R)-2-(isocyanomethyl)-4-[2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-7-[8-(trifluoromethyl)naphthalen-1-yl]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]prop-2-en-1-one is sourced from PubChem (CID 163509110), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).