Task: Answer the multiple choice question.
Question: Which compound has a 4.638\% hERG inhibition at a concentration of 1uM?
Constraint: You must select none, one or more options from a, b, or c without using any additional words.
Options:
a CC1=C(C#N)C(=O)N(C)C(C)(C)C1
b CCCNC(=S)Nc1ccc(Br)cc1
c O=C(NCCc1cccc(Cl)c1)c1cccs1
Answer: a. CC1=C(C#N)C(=O)N(C)C(C)(C)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#}
1,2,2,4-tetramethyl-6-oxo-3H-pyridine-5-carbonitrile