Task: Answer the MCQ question.
Question: Which compound exhibits a -4.037\% 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) CCCCNc1c([N+](=O)[O-])ncn1C
(b) Cc1ccc(C)c(NC(=O)CSc2nc3c(oc4ccccc43)c(=O)n2-c2ccccc2)c1
Answer: a. CCCCNc1c([N+](=O)[O-])ncn1C
{#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#}
CCCCNc1c([N+](=O)[O-])ncn1C
CCCCNc1c([N+](=O)[O-])ncn1C
N-butyl-3-methyl-5-nitroimidazol-4-amine