Task: Answer the multiple choice question.
Query: Which compound has a 18.489\% 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: Cc1ccc2[nH]c3c(=O)n(CCN4CCNCC4)cnc3c2c1
b: COC(=O)Cn1nc(-c2ccccc2)c2ccccc2c1=O
Answer: a. Cc1ccc2[nH]c3c(=O)n(CCN4CCNCC4)cnc3c2c1
{#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#}
Cc1ccc2[nH]c3c(=O)n(CCN4CCNCC4)cnc3c2c1
Cc1ccc2[nH]c3c(=O)n(CCN4CCNCC4)cnc3c2c1
8-methyl-3-(2-piperazin-1-ylethyl)-5H-pyrimido[5,4-b]indol-4-one