Task: Answer the MCQ question.
Question: Which compound has a 5.646\% hERG inhibition at a concentration of 1uM?
Constraint: You must select none, one or more options from a, b, c, d, or e without using any other words.
Options:
[a] O=c1c2ccccc2[nH]c2ccc(O)cc12
[b] COc1ccc(Cl)cc1NC(=O)C(=O)NC1CCCCCC1
[c] CC1(C)CC(=O)C2=C(C1)N(CCN1CCOCC1)C1=C(C(=O)CC(C)(C)C1)C2c1ccc(Cl)c([N+](=O)[O-])c1
[d] Cc1ccc(S(=O)(=O)NCCC(=O)NC2CCC(C)CC2)cc1
[e] COc1ccccc1NC(CC(=O)c1ccccc1)C(=O)OCC(=O)c1ccc(C)c(C)c1
Answer: a. O=c1c2ccccc2[nH]c2ccc(O)cc12
{#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#}
O=c1c2ccccc2[nH]c2ccc(O)cc12
O=c1c2ccccc2[nH]c2ccc(O)cc12
2-hydroxy-10H-acridin-9-one