Task: Answer the MCQ question.
Query: Which drug exhibits a -4.991\% 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 S=C=Nc1ccccn1
b COc1cc(C2SCC(=O)Nc3c2c(C)nn3-c2ccccc2)cc(OC)c1OC
c OCCOCCn1c(C(CO)Nc2nc(-c3ccc(F)cc3)cs2)nc2ccccc21
d CC(=O)Nc1ccc(NC(=O)C(C)OC(=O)CNS(=O)(=O)c2cccc(Cl)c2)cc1
Answer: a. S=C=Nc1ccccn1
{#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#}
S=C=Nc1ccccn1
S=C=Nc1ccccn1
2-isothiocyanatopyridine