Task: Answer the multiple-choice question.
Question: Which compound exhibits a 1.649\% 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) O=C1NC(c2ccccc2Cl)=N/C1=C/c1ccco1
(b) CCOC(=O)c1cnc2c(OC)cccc2c1Oc1ccccc1
(c) NC(=O)c1ccccc1NC(=O)Cc1cccs1
(d) CC(C)(C)c1nnc(NC(=O)C2c3ccccc3Oc3ccccc32)s1
Answer: a. O=C1NC(c2ccccc2Cl)=N/C1=C/c1ccco1
{#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=C1NC(c2ccccc2Cl)=N/C1=C/c1ccco1
O=C1NC(c2ccccc2Cl)=N/C1=C/c1ccco1
(4E)-2-(2-chlorophenyl)-4-(furan-2-ylmethylidene)-1H-imidazol-5-one