Task: Answer the multiple choice question.
Question: Which compound exhibits a 3.986\% hERG inhibition at a concentration of 1uM?
Constraint: You must select none, one or more options from a or b without using any additional words.
Options:
a: O=C(c1ccccc1)c1coc2c1C(=O)c1ccccc1C2=O
b: CCOC(=O)c1c(S(=O)(=O)N2CCN(C)CC2)c(C)n(C)c1C
Answer: a. O=C(c1ccccc1)c1coc2c1C(=O)c1ccccc1C2=O
{#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(c1ccccc1)c1coc2c1C(=O)c1ccccc1C2=O
O=C(c1ccccc1)c1coc2c1C(=O)c1ccccc1C2=O
3-benzoylbenzo[f][1]benzofuran-4,9-dione