Task: Answer the multiple choice question.
Query: Which drug has a 21.687\% 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 other words.
Options:
(a) CCOc1ccc(-n2c(=S)sc3c(=O)n(-c4ccccc4)c(SCC(=O)O)nc32)cc1
(b) c1ccc(CCNc2ncnc3sccc23)nc1
Answer: b. c1ccc(CCNc2ncnc3sccc23)nc1
{#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#}
c1ccc(CCNc2ncnc3sccc23)nc1
c1ccc(CCNc2ncnc3sccc23)nc1
N-(2-pyridin-2-ylethyl)thieno[2,3-d]pyrimidin-4-amine