Problem statement: Answer the multiple choice question.
Question: Which drug exhibits a 11.555\% human ether-à-go-go related gene (hERG) inhibition at 1uM?
Constraint: You must select none, one or more options from a or b without using any other words.
Options:
(a) O=c1oc2ccccc2c2nccnc12
(b) CCOC(=O)C1=C(COC(=O)C23CC4CC(CC(Br)(C4)C2)C3)NC(=O)NC1C
Answer: a. O=c1oc2ccccc2c2nccnc12
{#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=c1oc2ccccc2c2nccnc12
O=c1oc2ccccc2c2nccnc12
chromeno[3,4-b]pyrazin-5-one