2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile

C102H116BrF5N22O7 — CID 163461998

IUPAC2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile
SMILESC=C(F)C(=O)N1CCN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(Br)c24)C3)C[C@@H]1CC#N.C=C(F)C(=O)N1CCN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(C(F)(F)F)c24)C3)C[C@@H]1CC#N.CC(=O)N(C)C/C=C/C(=O)N1CCN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(C)c24)C3)C[C@@H]1CC#N
InChIInChI=1S/C37H46N8O3.C33H35F4N7O2.C32H35BrFN7O2/c1-26-9-5-10-28-11-6-13-33(35(26)28)43-20-16-31-32(24-43)39-37(48-25-30-12-7-19-42(30)4)40-36(31)44-21-22-45(29(23-44)15-17-38)34(47)14-8-18-41(3)27(2)46;1-21(34)31(45)44-17-16-43(18-23(44)11-13-38)30-25-12-15-42(19-27(25)39-32(40-30)46-20-24-8-5-14-41(24)2)28-10-4-7-22-6-3-9-26(29(22)28)33(35,36)37;1-21(34)31(42)41-17-16-40(18-23(41)11-13-35)30-25-12-15-39(28-10-4-7-22-6-3-9-26(33)29(22)28)19-27(25)36-32(37-30)43-20-24-8-5-14-38(24)2/h5-6,8-11,13-14,29-30H,7,12,15-16,18-25H2,1-4H3;3-4,6-7,9-10,23-24H,1,5,8,11-12,14-20H2,2H3;3-4,6-7,9-10,23-24H,1,5,8,11-12,14-20H2,2H3/b14-8+;;/t29-,30-;2*23-,24-/m000/s1
InChIKeyBPJVZUKSHICYEX-PFFKPDKISA-N
MW1937.09 g/mol
LogP13.88
Rot. Bonds23

About 2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile

2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile (PubChem CID 163461998) has the molecular formula C102H116BrF5N22O7 and a molecular weight of 1937.09 g/mol. Its IUPAC name is 2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile.

Molecular Properties

Compound Name2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile
PubChem CID163461998
Molecular FormulaC102H116BrF5N22O7
Molecular Weight1937.09 g/mol
Exact Mass1934.85
IUPAC Name2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile
SMILESC=C(F)C(=O)N1CCN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(Br)c24)C3)C[C@@H]1CC#N.C=C(F)C(=O)N1CCN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(C(F)(F)F)c24)C3)C[C@@H]1CC#N.CC(=O)N(C)C/C=C/C(=O)N1CCN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(C)c24)C3)C[C@@H]1CC#N
InChIInChI=1S/C37H46N8O3.C33H35F4N7O2.C32H35BrFN7O2/c1-26-9-5-10-28-11-6-13-33(35(26)28)43-20-16-31-32(24-43)39-37(48-25-30-12-7-19-42(30)4)40-36(31)44-21-22-45(29(23-44)15-17-38)34(47)14-8-18-41(3)27(2)46;1-21(34)31(45)44-17-16-43(18-23(44)11-13-38)30-25-12-15-42(19-27(25)39-32(40-30)46-20-24-8-5-14-41(24)2)28-10-4-7-22-6-3-9-26(29(22)28)33(35,36)37;1-21(34)31(42)41-17-16-40(18-23(41)11-13-35)30-25-12-15-39(28-10-4-7-22-6-3-9-26(33)29(22)28)19-27(25)36-32(37-30)43-20-24-8-5-14-38(24)2/h5-6,8-11,13-14,29-30H,7,12,15-16,18-25H2,1-4H3;3-4,6-7,9-10,23-24H,1,5,8,11-12,14-20H2,2H3;3-4,6-7,9-10,23-24H,1,5,8,11-12,14-20H2,2H3/b14-8+;;/t29-,30-;2*23-,24-/m000/s1
InChIKeyBPJVZUKSHICYEX-PFFKPDKISA-N
XLogP13.88
TPSA286.80 Ų
H-Bond Donors
H-Bond Acceptors25
Rotatable Bonds23
Heavy Atoms137
Complexity

Lipinski Rule of Five

3 violations

RuleValue
MW ≤ 5001937.09
LogP ≤ 513.88
H-Bond Donors ≤ 50
H-Bond Acceptors ≤ 1025

Computed Properties (RDKit)

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

Analyze 2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile with MolForge

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Related Compounds

Frequently Asked Questions

What is the IUPAC name of 2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile?
The IUPAC name of 2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile (CID 163461998) is 2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile.
What is the SMILES notation for 2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile?
The canonical SMILES for 2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile is C=C(F)C(=O)N1CCN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(Br)c24)C3)C[C@@H]1CC#N.C=C(F)C(=O)N1CCN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(C(F)(F)F)c24)C3)C[C@@H]1CC#N.CC(=O)N(C)C/C=C/C(=O)N1CCN(c2nc(OC[C@@H]3CCCN3C)nc3c2CCN(c2cccc4cccc(C)c24)C3)C[C@@H]1CC#N.
What is the InChIKey of 2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile?
The InChIKey is BPJVZUKSHICYEX-PFFKPDKISA-N. The full InChI is InChI=1S/C37H46N8O3.C33H35F4N7O2.C32H35BrFN7O2/c1-26-9-5-10-28-11-6-13-33(35(26)28)43-20-16-31-32(24-43)39-37(48-25-30-12-7-19-42(30)4)40-36(31)44-21-22-45(29(23-44)15-17-38)34(47)14-8-18-41(3)27(2)46;1-21(34)31(45)44-17-16-43(18-23(44)11-13-38)30-25-12-15-42(19-27(25)39-32(40-30)46-20-24-8-5-14-41(24)2)28-10-4-7-22-6-3-9-26(29(22)28)33(35,36)37;1-21(34)31(42)41-17-16-40(18-23(41)11-13-35)30-25-12-15-39(28-10-4-7-22-6-3-9-26(33)29(22)28)19-27(25)36-32(37-30)43-20-24-8-5-14-38(24)2/h5-6,8-11,13-14,29-30H,7,12,15-16,18-25H2,1-4H3;3-4,6-7,9-10,23-24H,1,5,8,11-12,14-20H2,2H3;3-4,6-7,9-10,23-24H,1,5,8,11-12,14-20H2,2H3/b14-8+;;/t29-,30-;2*23-,24-/m000/s1.
What are the key properties of 2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile?
2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile has a molecular weight of 1937.09 g/mol, XLogP of 13.88, 23 rotatable bonds, 0 hydrogen bond donors, and 25 hydrogen bond acceptors.
Where does this data come from?
All data for 2-[(2S)-4-[7-(8-bromonaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]-1-(2-fluoroprop-2-enoyl)piperazin-2-yl]acetonitrile;N-[(E)-4-[(2S)-2-(cyanomethyl)-4-[7-(8-methylnaphthalen-1-yl)-2-[[(2S)-1-methylpyrrolidin-2-yl]methoxy]-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]piperazin-1-yl]-4-oxobut-2-enyl]-N-methylacetamide;2-[(2S)-1-(2-fluoroprop-2-enoyl)-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-2-yl]acetonitrile is sourced from PubChem (CID 163461998), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).