Task: Answer the multiple-choice question.
Query: Which compound has a 18.818\% human ether-à-go-go related gene (hERG) inhibition at 1uM?
Constraint: You must select none, one or more options from a, b, c, or d without using any other words.
Options:
a: COC(=O)C1C(=O)c2c([nH]c(C(=O)OCC3CCCO3)c2C)CC1C
b: CCOC(=O)C(=CNc1cccc(C)c1C)C(=O)OCC
c: COC(=O)c1cc2sccc2n1Cc1nc(-c2ccc(OC)cc2)oc1C
d: Cc1ccc2nc(CCc3nc4ccc(C)cc4o3)oc2c1
Answer: b. CCOC(=O)C(=CNc1cccc(C)c1C)C(=O)OCC
{#Task|Problem statement!}: Answer the {#multiple choice|multiple-choice|MCQ!} question.
{#Question|Query!}: Which {#compound|drug!} {#has|exhibits!} a {herg_central_at_1uM#}{herg_central_at_1uM__units} {herg_central_at_1uM__names__noun}?
Constraint: You must select none, one or more options from {%multiple_choice_enum%2-5%aA1} without using any {#other|additional!} words.
Options:
{SMILES%herg_central_at_1uM%}
Answer: {%multiple_choice_result}. {SMILES#}
diethyl 2-[(2,3-dimethylanilino)methylidene]propanedioate