Task: Answer the multiple choice question.
Query: Which compound exhibits a 9.997\% 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, b, c, or d without using any other words.
Options:
a COc1cc(OC)c(NC(=O)CN(C)S(=O)(=O)c2ccc3[nH]c(=O)oc3c2)cc1Cl
b O=C1CC2(CCOCC2)Oc2ccc3ccccc3c21
c O=c1c(/C=N/N2CCOCC2)c(O)n(-c2ccccc2)c(=S)n1-c1ccccc1
d CCCCC(=O)Nc1cccc(-c2nnc(-c3ccccc3)o2)c1
Answer: b. O=C1CC2(CCOCC2)Oc2ccc3ccccc3c21
{#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=C1CC2(CCOCC2)Oc2ccc3ccccc3c21
O=C1CC2(CCOCC2)Oc2ccc3ccccc3c21
spiro[2H-benzo[f]chromene-3,4'-oxane]-1-one