Task: Answer the MCQ question.
Query: Which compound has a 4.586\% hERG inhibition at a concentration of 1uM?
Constraint: You must select none, one or more options from a or b without using any other words.
Options:
[a] O=S1(=O)CCC(N2CCOCC2)C1
[b] O=C(NCc1ccccc1OC(F)(F)F)C1CCC(=O)N(CCc2ccccn2)C1
Answer: a. O=S1(=O)CCC(N2CCOCC2)C1
{#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=S1(=O)CCC(N2CCOCC2)C1
O=S1(=O)CCC(N2CCOCC2)C1
4-(1,1-dioxothiolan-3-yl)morpholine