Problem statement: Answer the multiple-choice question.
Question: Which compound has a 4.000\% 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] COc1ccc(N(Cc2cc3cc(OC)ccc3[nH]c2=O)S(C)(=O)=O)cc1
[b] NNC(=O)c1cn2ccccc2n1
Answer: b. NNC(=O)c1cn2ccccc2n1
{#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#}
imidazo[1,2-a]pyridine-2-carbohydrazide