Task: Answer the multiple choice question.
Query: Which compound has a -1.933\% 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] COc1ccccc1Nc1nnc(SCC(=O)N2CCCC2)s1
[b] CCCCN(CC)C(=O)c1ccc(Cl)cc1
Answer: a. COc1ccccc1Nc1nnc(SCC(=O)N2CCCC2)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#}
2-[[5-(2-methoxyanilino)-1,3,4-thiadiazol-2-yl]sulfanyl]-1-pyrrolidin-1-ylethanone