Task: Answer the multiple choice question.
Query: Which compound has a 16.000\% human ether-à-go-go related gene (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) CCCCn1cnc2c([nH]c3ccccc32)c1=O
b) COc1ccc(C(=O)c2c(C)c3cc(C)ccc3n2CC(O)CN2CCOCC2)cc1.Cl
Answer: a. CCCCn1cnc2c([nH]c3ccccc32)c1=O
{#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#}
CCCCn1cnc2c([nH]c3ccccc32)c1=O
CCCCn1cnc2c([nH]c3ccccc32)c1=O
3-butyl-5H-pyrimido[5,4-b]indol-4-one