Task: Answer the multiple-choice question.
Query: Which compound exhibits a 2.167\% 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) CCCCN(CC)C(=O)c1n[nH]c(=O)c2ccccc12
b) COc1ccc(Nc2nc(Nc3ccc(OC)cc3OC)nc(N3CCN(C)CC3)n2)c(OC)c1
Answer: a. CCCCN(CC)C(=O)c1n[nH]c(=O)c2ccccc12
{#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#}
CCCCN(CC)C(=O)c1n[nH]c(=O)c2ccccc12
CCCCN(CC)C(=O)c1n[nH]c(=O)c2ccccc12
N-butyl-N-ethyl-4-oxo-3H-phthalazine-1-carboxamide