Task: Answer the multiple choice question.
Query: Which compound exhibits a -4.968\% 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=c1[nH]nc(Cc2ccccn2)c2ccccc12
b.) CC(NC(=O)c1ccccc1)C(=O)N/N=C/c1ccc(O)cc1
Answer: a. O=c1[nH]nc(Cc2ccccn2)c2ccccc12
{#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#}
4-(pyridin-2-ylmethyl)-2H-phthalazin-1-one