Task: Answer the MCQ question.
Query: Which compound has a 21.404\% hERG inhibition at 1uM?
Constraint: You must select none, one or more options from a, b, or c without using any other words.
Options:
a. Cc1ccc(CNc2cnccn2)s1
b. CCCn1c(NCc2ccccn2)nc2ccccc21
c. O=C(NCc1cccnc1)Nc1cccc(C(F)(F)F)c1
Answer: a. Cc1ccc(CNc2cnccn2)s1
{#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#}
Cc1ccc(CNc2cnccn2)s1
Cc1ccc(CNc2cnccn2)s1
N-[(5-methylthiophen-2-yl)methyl]pyrazin-2-amine