bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid

C120H132N12O32S4 — CID 167616658

IUPACbis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid
SMILESCOc1ccccc1[C@H](Cn1c(=O)n(C(C)(C)C(=O)O)c(=O)c2c(C)c(-c3ncco3)sc21)OC1C[C@@H]2COC[C@H]2C1.COc1ccccc1[C@H](Cn1c(=O)n(C(C)(C)C(=O)O)c(=O)c2c(C)c(-c3ncco3)sc21)OC1C[C@H]2COC[C@@H]2C1.COc1ccccc1[C@H](Cn1c(=O)n(C(C)(C)C(=O)O)c(=O)c2c(C)c(-c3ncco3)sc21)OC1C[C@H]2COC[C@H]2C1.COc1ccccc1[C@H](Cn1c(=O)n(C(C)(C)C(=O)O)c(=O)c2c(C)c(-c3ncco3)sc21)OC1C[C@H]2COC[C@H]2C1
InChIInChI=1S/4C30H33N3O8S/c4*1-16-23-26(34)33(30(2,3)28(35)36)29(37)32(27(23)42-24(16)25-31-9-10-40-25)13-22(20-7-5-6-8-21(20)38-4)41-19-11-17-14-39-15-18(17)12-19/h4*5-10,17-19,22H,11-15H2,1-4H3,(H,35,36)/t2*17-,18+,19?,22-;17-,18-,22+;17-,18-,22-/m0010/s1
InChIKeyLVMQAJPKVNBEDO-XODYMJAWSA-N
MW2382.70 g/mol
LogP16.80
Rot. Bonds36

About bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid

bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid (PubChem CID 167616658) has the molecular formula C120H132N12O32S4 and a molecular weight of 2382.70 g/mol. Its IUPAC name is bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid.

Molecular Properties

Compound Namebis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid
PubChem CID167616658
Molecular FormulaC120H132N12O32S4
Molecular Weight2382.70 g/mol
Exact Mass2380.80
IUPAC Namebis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid
SMILESCOc1ccccc1[C@H](Cn1c(=O)n(C(C)(C)C(=O)O)c(=O)c2c(C)c(-c3ncco3)sc21)OC1C[C@@H]2COC[C@H]2C1.COc1ccccc1[C@H](Cn1c(=O)n(C(C)(C)C(=O)O)c(=O)c2c(C)c(-c3ncco3)sc21)OC1C[C@H]2COC[C@@H]2C1.COc1ccccc1[C@H](Cn1c(=O)n(C(C)(C)C(=O)O)c(=O)c2c(C)c(-c3ncco3)sc21)OC1C[C@H]2COC[C@H]2C1.COc1ccccc1[C@H](Cn1c(=O)n(C(C)(C)C(=O)O)c(=O)c2c(C)c(-c3ncco3)sc21)OC1C[C@H]2COC[C@H]2C1
InChIInChI=1S/4C30H33N3O8S/c4*1-16-23-26(34)33(30(2,3)28(35)36)29(37)32(27(23)42-24(16)25-31-9-10-40-25)13-22(20-7-5-6-8-21(20)38-4)41-19-11-17-14-39-15-18(17)12-19/h4*5-10,17-19,22H,11-15H2,1-4H3,(H,35,36)/t2*17-,18+,19?,22-;17-,18-,22+;17-,18-,22-/m0010/s1
InChIKeyLVMQAJPKVNBEDO-XODYMJAWSA-N
XLogP16.80
TPSA540.08 Ų
H-Bond Donors4
H-Bond Acceptors44
Rotatable Bonds36
Heavy Atoms168
Complexity

Lipinski Rule of Five

3 violations

RuleValue
MW ≤ 5002382.70
LogP ≤ 516.80
H-Bond Donors ≤ 54
H-Bond Acceptors ≤ 1044

Analyze bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid with MolForge

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Frequently Asked Questions

What is the IUPAC name of bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid?
The IUPAC name of bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid (CID 167616658) is bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid.
What is the SMILES notation for bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid?
The canonical SMILES for bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid is COc1ccccc1[C@H](Cn1c(=O)n(C(C)(C)C(=O)O)c(=O)c2c(C)c(-c3ncco3)sc21)OC1C[C@@H]2COC[C@H]2C1.COc1ccccc1[C@H](Cn1c(=O)n(C(C)(C)C(=O)O)c(=O)c2c(C)c(-c3ncco3)sc21)OC1C[C@H]2COC[C@@H]2C1.COc1ccccc1[C@H](Cn1c(=O)n(C(C)(C)C(=O)O)c(=O)c2c(C)c(-c3ncco3)sc21)OC1C[C@H]2COC[C@H]2C1.COc1ccccc1[C@H](Cn1c(=O)n(C(C)(C)C(=O)O)c(=O)c2c(C)c(-c3ncco3)sc21)OC1C[C@H]2COC[C@H]2C1.
What is the InChIKey of bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid?
The InChIKey is LVMQAJPKVNBEDO-XODYMJAWSA-N. The full InChI is InChI=1S/4C30H33N3O8S/c4*1-16-23-26(34)33(30(2,3)28(35)36)29(37)32(27(23)42-24(16)25-31-9-10-40-25)13-22(20-7-5-6-8-21(20)38-4)41-19-11-17-14-39-15-18(17)12-19/h4*5-10,17-19,22H,11-15H2,1-4H3,(H,35,36)/t2*17-,18+,19?,22-;17-,18-,22+;17-,18-,22-/m0010/s1.
What are the key properties of bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid?
bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid has a molecular weight of 2382.70 g/mol, XLogP of 16.80, 36 rotatable bonds, 4 hydrogen bond donors, and 44 hydrogen bond acceptors.
Where does this data come from?
All data for bis(2-[1-[(2R)-2-[[(3aS,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid);2-[1-[(2R)-2-[[(3aR,6aR)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid;2-[1-[(2R)-2-[[(3aS,6aS)-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]furan-5-yl]oxy]-2-(2-methoxyphenyl)ethyl]-5-methyl-6-(1,3-oxazol-2-yl)-2,4-dioxothieno[2,3-d]pyrimidin-3-yl]-2-methylpropanoic acid is sourced from PubChem (CID 167616658), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).