(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate

C90H140N20O30 — CID 160797530

IUPAC(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate
SMILESC[13CH2][13CH]1[13CH2][13CH2][13CH2]N1[13CH2][13C](=O)NCCC(=O)NCCC(=O)ON1C(=O)CCC1=O.C[13CH2][13CH]1[13CH2][13CH2][13CH2][15N]1C[13C](=O)NCCC(=O)NCC[13C](=O)ON1C(=O)CCC1=O.C[13CH2][13CH]1[13CH2][13CH2][13CH2][15N]1[13CH2][13C](=O)NCCC(=O)NCCC(=O)ON1C(=O)CCC1=O.[13CH3][13CH2][13CH]1[13CH2][13CH2][13CH2]N1[13CH2][13C](=O)NCCC(=O)NCCC(=O)ON1C(=O)CCC1=O.[13CH3][13CH2][13CH]1[13CH2][13CH2][13CH2][15N]1[13CH2]C(=O)NCCC(=O)NCCC(=O)ON1C(=O)CCC1=O
InChIInChI=1S/5C18H28N4O6/c5*1-2-13-4-3-11-21(13)12-15(24)20-9-7-14(23)19-10-8-18(27)28-22-16(25)5-6-17(22)26/h5*13H,2-12H2,1H3,(H,19,23)(H,20,24)/i2+1,3+1,4+1,11+1,13+1,15+1,18+1,21+1;2+1,3+1,4+1,11+1,12+1,13+1,15+1,21+1;1+1,2+1,3+1,4+1,11+1,12+1,13+1,21+1;1+1,2+1,3+1,4+1,11+1,12+1,13+1,15+1;2+1,3+1,4+1,11+1,12+1,13+1,15+1
InChIKeySCQCBUJELQKBNJ-KAGODSKKSA-N
MW2020.92 g/mol
LogP-2.60
Rot. Bonds50

About (2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate

(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate (PubChem CID 160797530) has the molecular formula C90H140N20O30 and a molecular weight of 2020.92 g/mol. Its IUPAC name is (2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate.

Molecular Properties

Compound Name(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate
PubChem CID160797530
Molecular FormulaC90H140N20O30
Molecular Weight2020.92 g/mol
Exact Mass2020.12
IUPAC Name(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate
SMILESC[13CH2][13CH]1[13CH2][13CH2][13CH2]N1[13CH2][13C](=O)NCCC(=O)NCCC(=O)ON1C(=O)CCC1=O.C[13CH2][13CH]1[13CH2][13CH2][13CH2][15N]1C[13C](=O)NCCC(=O)NCC[13C](=O)ON1C(=O)CCC1=O.C[13CH2][13CH]1[13CH2][13CH2][13CH2][15N]1[13CH2][13C](=O)NCCC(=O)NCCC(=O)ON1C(=O)CCC1=O.[13CH3][13CH2][13CH]1[13CH2][13CH2][13CH2]N1[13CH2][13C](=O)NCCC(=O)NCCC(=O)ON1C(=O)CCC1=O.[13CH3][13CH2][13CH]1[13CH2][13CH2][13CH2][15N]1[13CH2]C(=O)NCCC(=O)NCCC(=O)ON1C(=O)CCC1=O
InChIInChI=1S/5C18H28N4O6/c5*1-2-13-4-3-11-21(13)12-15(24)20-9-7-14(23)19-10-8-18(27)28-22-16(25)5-6-17(22)26/h5*13H,2-12H2,1H3,(H,19,23)(H,20,24)/i2+1,3+1,4+1,11+1,13+1,15+1,18+1,21+1;2+1,3+1,4+1,11+1,12+1,13+1,15+1,21+1;1+1,2+1,3+1,4+1,11+1,12+1,13+1,21+1;1+1,2+1,3+1,4+1,11+1,12+1,13+1,15+1;2+1,3+1,4+1,11+1,12+1,13+1,15+1
InChIKeySCQCBUJELQKBNJ-KAGODSKKSA-N
XLogP-2.60
TPSA625.60 Ų
H-Bond Donors10
H-Bond Acceptors35
Rotatable Bonds50
Heavy Atoms140
Complexity

Lipinski Rule of Five

3 violations

RuleValue
MW ≤ 5002020.92
LogP ≤ 5-2.60
H-Bond Donors ≤ 510
H-Bond Acceptors ≤ 1035

Computed Properties (RDKit)

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

Analyze (2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate with MolForge

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Frequently Asked Questions

What is the IUPAC name of (2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate?
The IUPAC name of (2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate (CID 160797530) is (2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate.
What is the SMILES notation for (2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate?
The canonical SMILES for (2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate is C[13CH2][13CH]1[13CH2][13CH2][13CH2]N1[13CH2][13C](=O)NCCC(=O)NCCC(=O)ON1C(=O)CCC1=O.C[13CH2][13CH]1[13CH2][13CH2][13CH2][15N]1C[13C](=O)NCCC(=O)NCC[13C](=O)ON1C(=O)CCC1=O.C[13CH2][13CH]1[13CH2][13CH2][13CH2][15N]1[13CH2][13C](=O)NCCC(=O)NCCC(=O)ON1C(=O)CCC1=O.[13CH3][13CH2][13CH]1[13CH2][13CH2][13CH2]N1[13CH2][13C](=O)NCCC(=O)NCCC(=O)ON1C(=O)CCC1=O.[13CH3][13CH2][13CH]1[13CH2][13CH2][13CH2][15N]1[13CH2]C(=O)NCCC(=O)NCCC(=O)ON1C(=O)CCC1=O.
What is the InChIKey of (2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate?
The InChIKey is SCQCBUJELQKBNJ-KAGODSKKSA-N. The full InChI is InChI=1S/5C18H28N4O6/c5*1-2-13-4-3-11-21(13)12-15(24)20-9-7-14(23)19-10-8-18(27)28-22-16(25)5-6-17(22)26/h5*13H,2-12H2,1H3,(H,19,23)(H,20,24)/i2+1,3+1,4+1,11+1,13+1,15+1,18+1,21+1;2+1,3+1,4+1,11+1,12+1,13+1,15+1,21+1;1+1,2+1,3+1,4+1,11+1,12+1,13+1,21+1;1+1,2+1,3+1,4+1,11+1,12+1,13+1,15+1;2+1,3+1,4+1,11+1,12+1,13+1,15+1.
What are the key properties of (2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate?
(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate has a molecular weight of 2020.92 g/mol, XLogP of -2.60, 50 rotatable bonds, 10 hydrogen bond donors, and 35 hydrogen bond acceptors.
Where does this data come from?
All data for (2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(1,2-13C2)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino]propanoate;(2,5-dioxopyrrolidin-1-yl) 3-[3-[[2-(2-(113C)ethyl(2,3,4,5-13C4,115N)azolidin-1-yl)acetyl]amino]propanoylamino](113C)propanoate is sourced from PubChem (CID 160797530), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).