(3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione

C102H88Cl4F2N30O11 — CID 158335930

IUPAC(3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione
SMILESCOc1ccc(Nc2cc(NC3CC3)n3ncc(/C=C4\CC(=O)NC4=O)c3n2)cc1Cl.Cc1ccc(Nc2cc(NC3CC3)n3ncc(/C=C4\CC(=O)NC4=O)c3n2)cc1Cl.O=C1C/C(=C\c2cnn3c(NC4CC4)cc(Nc4cccc(F)c4Cl)nc23)C(=O)N1.O=C1C/C(=C\c2cnn3c(NC4CC4)cc(Nc4ccccc4Cl)nc23)C(=O)N1.O=C1C/C(=C\c2cnn3c(NC4CC4)cc(Nc4ccccc4F)nc23)C(=O)N1
InChIInChI=1S/C21H19ClN6O3.C21H19ClN6O2.C20H16ClFN6O2.C20H17ClN6O2.C20H17FN6O2/c1-31-16-5-4-14(8-15(16)22)24-17-9-18(25-13-2-3-13)28-20(26-17)12(10-23-28)6-11-7-19(29)27-21(11)30;1-11-2-3-15(8-16(11)22)24-17-9-18(25-14-4-5-14)28-20(26-17)13(10-23-28)6-12-7-19(29)27-21(12)30;21-18-13(22)2-1-3-14(18)25-15-8-16(24-12-4-5-12)28-19(26-15)11(9-23-28)6-10-7-17(29)27-20(10)30;2*21-14-3-1-2-4-15(14)24-16-9-17(23-13-5-6-13)27-19(25-16)12(10-22-27)7-11-8-18(28)26-20(11)29/h4-6,8-10,13,25H,2-3,7H2,1H3,(H,24,26)(H,27,29,30);2-3,6,8-10,14,25H,4-5,7H2,1H3,(H,24,26)(H,27,29,30);1-3,6,8-9,12,24H,4-5,7H2,(H,25,26)(H,27,29,30);2*1-4,7,9-10,13,23H,5-6,8H2,(H,24,25)(H,26,28,29)/b11-6+;12-6+;10-6+;2*11-7+
InChIKeyGQOQQURFWLKIGX-MRYHJPSTSA-N
MW2089.83 g/mol
LogP15.59
Rot. Bonds26

About (3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione

(3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione (PubChem CID 158335930) has the molecular formula C102H88Cl4F2N30O11 and a molecular weight of 2089.83 g/mol. Its IUPAC name is (3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione.

Molecular Properties

Compound Name(3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione
PubChem CID158335930
Molecular FormulaC102H88Cl4F2N30O11
Molecular Weight2089.83 g/mol
Exact Mass2086.60
IUPAC Name(3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione
SMILESCOc1ccc(Nc2cc(NC3CC3)n3ncc(/C=C4\CC(=O)NC4=O)c3n2)cc1Cl.Cc1ccc(Nc2cc(NC3CC3)n3ncc(/C=C4\CC(=O)NC4=O)c3n2)cc1Cl.O=C1C/C(=C\c2cnn3c(NC4CC4)cc(Nc4cccc(F)c4Cl)nc23)C(=O)N1.O=C1C/C(=C\c2cnn3c(NC4CC4)cc(Nc4ccccc4Cl)nc23)C(=O)N1.O=C1C/C(=C\c2cnn3c(NC4CC4)cc(Nc4ccccc4F)nc23)C(=O)N1
InChIInChI=1S/C21H19ClN6O3.C21H19ClN6O2.C20H16ClFN6O2.C20H17ClN6O2.C20H17FN6O2/c1-31-16-5-4-14(8-15(16)22)24-17-9-18(25-13-2-3-13)28-20(26-17)12(10-23-28)6-11-7-19(29)27-21(11)30;1-11-2-3-15(8-16(11)22)24-17-9-18(25-14-4-5-14)28-20(26-17)13(10-23-28)6-12-7-19(29)27-21(12)30;21-18-13(22)2-1-3-14(18)25-15-8-16(24-12-4-5-12)28-19(26-15)11(9-23-28)6-10-7-17(29)27-20(10)30;2*21-14-3-1-2-4-15(14)24-16-9-17(23-13-5-6-13)27-19(25-16)12(10-22-27)7-11-8-18(28)26-20(11)29/h4-6,8-10,13,25H,2-3,7H2,1H3,(H,24,26)(H,27,29,30);2-3,6,8-10,14,25H,4-5,7H2,1H3,(H,24,26)(H,27,29,30);1-3,6,8-9,12,24H,4-5,7H2,(H,25,26)(H,27,29,30);2*1-4,7,9-10,13,23H,5-6,8H2,(H,24,25)(H,26,28,29)/b11-6+;12-6+;10-6+;2*11-7+
InChIKeyGQOQQURFWLKIGX-MRYHJPSTSA-N
XLogP15.59
TPSA511.33 Ų
H-Bond Donors15
H-Bond Acceptors36
Rotatable Bonds26
Heavy Atoms149
Complexity

Lipinski Rule of Five

4 violations

RuleValue
MW ≤ 5002089.83
LogP ≤ 515.59
H-Bond Donors ≤ 515
H-Bond Acceptors ≤ 1036

Computed Properties (RDKit)

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

Analyze (3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione with MolForge

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Related Compounds

Frequently Asked Questions

What is the IUPAC name of (3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione?
The IUPAC name of (3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione (CID 158335930) is (3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione.
What is the SMILES notation for (3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione?
The canonical SMILES for (3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione is COc1ccc(Nc2cc(NC3CC3)n3ncc(/C=C4\CC(=O)NC4=O)c3n2)cc1Cl.Cc1ccc(Nc2cc(NC3CC3)n3ncc(/C=C4\CC(=O)NC4=O)c3n2)cc1Cl.O=C1C/C(=C\c2cnn3c(NC4CC4)cc(Nc4cccc(F)c4Cl)nc23)C(=O)N1.O=C1C/C(=C\c2cnn3c(NC4CC4)cc(Nc4ccccc4Cl)nc23)C(=O)N1.O=C1C/C(=C\c2cnn3c(NC4CC4)cc(Nc4ccccc4F)nc23)C(=O)N1.
What is the InChIKey of (3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione?
The InChIKey is GQOQQURFWLKIGX-MRYHJPSTSA-N. The full InChI is InChI=1S/C21H19ClN6O3.C21H19ClN6O2.C20H16ClFN6O2.C20H17ClN6O2.C20H17FN6O2/c1-31-16-5-4-14(8-15(16)22)24-17-9-18(25-13-2-3-13)28-20(26-17)12(10-23-28)6-11-7-19(29)27-21(11)30;1-11-2-3-15(8-16(11)22)24-17-9-18(25-14-4-5-14)28-20(26-17)13(10-23-28)6-12-7-19(29)27-21(12)30;21-18-13(22)2-1-3-14(18)25-15-8-16(24-12-4-5-12)28-19(26-15)11(9-23-28)6-10-7-17(29)27-20(10)30;2*21-14-3-1-2-4-15(14)24-16-9-17(23-13-5-6-13)27-19(25-16)12(10-22-27)7-11-8-18(28)26-20(11)29/h4-6,8-10,13,25H,2-3,7H2,1H3,(H,24,26)(H,27,29,30);2-3,6,8-10,14,25H,4-5,7H2,1H3,(H,24,26)(H,27,29,30);1-3,6,8-9,12,24H,4-5,7H2,(H,25,26)(H,27,29,30);2*1-4,7,9-10,13,23H,5-6,8H2,(H,24,25)(H,26,28,29)/b11-6+;12-6+;10-6+;2*11-7+.
What are the key properties of (3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione?
(3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione has a molecular weight of 2089.83 g/mol, XLogP of 15.59, 26 rotatable bonds, 15 hydrogen bond donors, and 36 hydrogen bond acceptors.
Where does this data come from?
All data for (3E)-3-[[5-(2-chloroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(2-chloro-3-fluoroanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methoxyanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[5-(3-chloro-4-methylanilino)-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione;(3E)-3-[[7-(cyclopropylamino)-5-(2-fluoroanilino)pyrazolo[1,5-a]pyrimidin-3-yl]methylidene]pyrrolidine-2,5-dione is sourced from PubChem (CID 158335930), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).