Task: Answer the multiple-choice question.
Query: Which compound exhibits a 1.989\% human ether-à-go-go related gene (hERG) inhibition at a concentration of 1uM?
Constraint: You must select none, one or more options from a, b, c, or d without using any additional words.
Options:
a: CCCCC(=O)N1CCN(c2nc3ccc(Cl)cc3s2)CC1
b: O=C(CN1CCOCC1)Nc1ccc(C2CCCCC2)cc1
c: CC(C)CNS(=O)(=O)c1cc(C(=O)OC2CCOC2=O)c(Cl)cc1Cl
d: CCc1ccc(C(=O)NCC2COc3ccccc3O2)o1
Answer: b. O=C(CN1CCOCC1)Nc1ccc(C2CCCCC2)cc1
{#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#}
O=C(CN1CCOCC1)Nc1ccc(C2CCCCC2)cc1
O=C(CN1CCOCC1)Nc1ccc(C2CCCCC2)cc1
N-(4-cyclohexylphenyl)-2-morpholin-4-ylacetamide