4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide

C116H111Br2FN30O19S6 — CID 158216778

IUPAC4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide
SMILESCCNS(=O)(=O)c1ccc(CNc2nccn3c(-c4ccc(O)cc4)cnc23)cc1.CNS(=O)(=O)c1ccc(CNc2nccn3c(-c4ccc(O)cc4)cnc23)cc1.COc1cc(-c2c(C)nc3c(NCc4ccc(S(N)(=O)=O)cc4)nccn23)ccc1O.COc1cc(-c2cnc3c(NCc4ccc(S(N)(=O)=O)cc4)ncc(C)n23)ccc1O.Cc1nc2c(NCc3ccc(S(N)(=O)=O)cc3)nccn2c1-c1ccc(O)c(F)c1.NS(=O)(=O)c1ccc(CNc2nc(Br)cn3c(Br)cnc23)cc1
InChIInChI=1S/2C21H21N5O4S.C21H21N5O3S.C20H18FN5O3S.C20H19N5O3S.C13H11Br2N5O2S/c1-13-10-23-20(24-11-14-3-6-16(7-4-14)31(22,28)29)21-25-12-17(26(13)21)15-5-8-18(27)19(9-15)30-2;1-13-19(15-5-8-17(27)18(11-15)30-2)26-10-9-23-20(21(26)25-13)24-12-14-3-6-16(7-4-14)31(22,28)29;1-2-25-30(28,29)18-9-3-15(4-10-18)13-23-20-21-24-14-19(26(21)12-11-22-20)16-5-7-17(27)8-6-16;1-12-18(14-4-7-17(27)16(21)10-14)26-9-8-23-19(20(26)25-12)24-11-13-2-5-15(6-3-13)30(22,28)29;1-21-29(27,28)17-8-2-14(3-9-17)12-23-19-20-24-13-18(25(20)11-10-22-19)15-4-6-16(26)7-5-15;14-10-7-20-11(15)6-18-13(20)12(19-10)17-5-8-1-3-9(4-2-8)23(16,21)22/h3-10,12,27H,11H2,1-2H3,(H,23,24)(H2,22,28,29);3-11,27H,12H2,1-2H3,(H,23,24)(H2,22,28,29);3-12,14,25,27H,2,13H2,1H3,(H,22,23);2-10,27H,11H2,1H3,(H,23,24)(H2,22,28,29);2-11,13,21,26H,12H2,1H3,(H,22,23);1-4,6-7H,5H2,(H,17,19)(H2,16,21,22)
InChIKeyGCTDKLXGEUEECN-UHFFFAOYSA-N
MW2600.56 g/mol
LogP16.31
Rot. Bonds34

About 4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide

4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide (PubChem CID 158216778) has the molecular formula C116H111Br2FN30O19S6 and a molecular weight of 2600.56 g/mol. Its IUPAC name is 4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide.

Molecular Properties

Compound Name4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide
PubChem CID158216778
Molecular FormulaC116H111Br2FN30O19S6
Molecular Weight2600.56 g/mol
Exact Mass2596.53
IUPAC Name4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide
SMILESCCNS(=O)(=O)c1ccc(CNc2nccn3c(-c4ccc(O)cc4)cnc23)cc1.CNS(=O)(=O)c1ccc(CNc2nccn3c(-c4ccc(O)cc4)cnc23)cc1.COc1cc(-c2c(C)nc3c(NCc4ccc(S(N)(=O)=O)cc4)nccn23)ccc1O.COc1cc(-c2cnc3c(NCc4ccc(S(N)(=O)=O)cc4)ncc(C)n23)ccc1O.Cc1nc2c(NCc3ccc(S(N)(=O)=O)cc3)nccn2c1-c1ccc(O)c(F)c1.NS(=O)(=O)c1ccc(CNc2nc(Br)cn3c(Br)cnc23)cc1
InChIInChI=1S/2C21H21N5O4S.C21H21N5O3S.C20H18FN5O3S.C20H19N5O3S.C13H11Br2N5O2S/c1-13-10-23-20(24-11-14-3-6-16(7-4-14)31(22,28)29)21-25-12-17(26(13)21)15-5-8-18(27)19(9-15)30-2;1-13-19(15-5-8-17(27)18(11-15)30-2)26-10-9-23-20(21(26)25-13)24-12-14-3-6-16(7-4-14)31(22,28)29;1-2-25-30(28,29)18-9-3-15(4-10-18)13-23-20-21-24-14-19(26(21)12-11-22-20)16-5-7-17(27)8-6-16;1-12-18(14-4-7-17(27)16(21)10-14)26-9-8-23-19(20(26)25-12)24-11-13-2-5-15(6-3-13)30(22,28)29;1-21-29(27,28)17-8-2-14(3-9-17)12-23-19-20-24-13-18(25(20)11-10-22-19)15-4-6-16(26)7-5-15;14-10-7-20-11(15)6-18-13(20)12(19-10)17-5-8-1-3-9(4-2-8)23(16,21)22/h3-10,12,27H,11H2,1-2H3,(H,23,24)(H2,22,28,29);3-11,27H,12H2,1-2H3,(H,23,24)(H2,22,28,29);3-12,14,25,27H,2,13H2,1H3,(H,22,23);2-10,27H,11H2,1H3,(H,23,24)(H2,22,28,29);2-11,13,21,26H,12H2,1H3,(H,22,23);1-4,6-7H,5H2,(H,17,19)(H2,16,21,22)
InChIKeyGCTDKLXGEUEECN-UHFFFAOYSA-N
XLogP16.31
TPSA705.91 Ų
H-Bond Donors17
H-Bond Acceptors43
Rotatable Bonds34
Heavy Atoms174
Complexity

Lipinski Rule of Five

4 violations

RuleValue
MW ≤ 5002600.56
LogP ≤ 516.31
H-Bond Donors ≤ 517
H-Bond Acceptors ≤ 1043

Analyze 4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide with MolForge

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Frequently Asked Questions

What is the IUPAC name of 4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide?
The IUPAC name of 4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide (CID 158216778) is 4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide.
What is the SMILES notation for 4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide?
The canonical SMILES for 4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide is CCNS(=O)(=O)c1ccc(CNc2nccn3c(-c4ccc(O)cc4)cnc23)cc1.CNS(=O)(=O)c1ccc(CNc2nccn3c(-c4ccc(O)cc4)cnc23)cc1.COc1cc(-c2c(C)nc3c(NCc4ccc(S(N)(=O)=O)cc4)nccn23)ccc1O.COc1cc(-c2cnc3c(NCc4ccc(S(N)(=O)=O)cc4)ncc(C)n23)ccc1O.Cc1nc2c(NCc3ccc(S(N)(=O)=O)cc3)nccn2c1-c1ccc(O)c(F)c1.NS(=O)(=O)c1ccc(CNc2nc(Br)cn3c(Br)cnc23)cc1.
What is the InChIKey of 4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide?
The InChIKey is GCTDKLXGEUEECN-UHFFFAOYSA-N. The full InChI is InChI=1S/2C21H21N5O4S.C21H21N5O3S.C20H18FN5O3S.C20H19N5O3S.C13H11Br2N5O2S/c1-13-10-23-20(24-11-14-3-6-16(7-4-14)31(22,28)29)21-25-12-17(26(13)21)15-5-8-18(27)19(9-15)30-2;1-13-19(15-5-8-17(27)18(11-15)30-2)26-10-9-23-20(21(26)25-13)24-12-14-3-6-16(7-4-14)31(22,28)29;1-2-25-30(28,29)18-9-3-15(4-10-18)13-23-20-21-24-14-19(26(21)12-11-22-20)16-5-7-17(27)8-6-16;1-12-18(14-4-7-17(27)16(21)10-14)26-9-8-23-19(20(26)25-12)24-11-13-2-5-15(6-3-13)30(22,28)29;1-21-29(27,28)17-8-2-14(3-9-17)12-23-19-20-24-13-18(25(20)11-10-22-19)15-4-6-16(26)7-5-15;14-10-7-20-11(15)6-18-13(20)12(19-10)17-5-8-1-3-9(4-2-8)23(16,21)22/h3-10,12,27H,11H2,1-2H3,(H,23,24)(H2,22,28,29);3-11,27H,12H2,1-2H3,(H,23,24)(H2,22,28,29);3-12,14,25,27H,2,13H2,1H3,(H,22,23);2-10,27H,11H2,1H3,(H,23,24)(H2,22,28,29);2-11,13,21,26H,12H2,1H3,(H,22,23);1-4,6-7H,5H2,(H,17,19)(H2,16,21,22).
What are the key properties of 4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide?
4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide has a molecular weight of 2600.56 g/mol, XLogP of 16.31, 34 rotatable bonds, 17 hydrogen bond donors, and 43 hydrogen bond acceptors.
Where does this data come from?
All data for 4-[[(3,6-dibromoimidazo[1,2-a]pyrazin-8-yl)amino]methyl]benzenesulfonamide;N-ethyl-4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(3-fluoro-4-hydroxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-2-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxy-3-methoxyphenyl)-5-methylimidazo[1,2-a]pyrazin-8-yl]amino]methyl]benzenesulfonamide;4-[[[3-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-8-yl]amino]methyl]-N-methylbenzenesulfonamide is sourced from PubChem (CID 158216778), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).