Task: Answer the MCQ question.
Query: Which compound exhibits a 6.456\% 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(c1cccc(Oc2c(Cl)cccc2[N+](=O)[O-])c1)N1CCCCC1
b: O=S1(=O)CC(O)C(NCCCO)C1
Answer: b. O=S1(=O)CC(O)C(NCCCO)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)CC(O)C(NCCCO)C1
O=S1(=O)CC(O)C(NCCCO)C1
4-(3-hydroxypropylamino)-1,1-dioxothiolan-3-ol