Task: Answer the multiple choice question.
Query: Which compound has a 18.398\% 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. CCN1CCC(N2CCN(c3ccccc3OC)CC2)CC1
b. O=C(NNc1cccc(Cl)n1)c1c(F)cccc1F
c. COc1ccc2cc(C(=O)N3CCN(Cc4ccc5c(c4)OCO5)CC3)[nH]c2c1
d. CCN(Cc1ccccc1)S(=O)(=O)c1ccc(C(=O)N(CCCN(C)C)c2nc3cc4c(cc3s2)OCCO4)cc1.Cl
Answer: a. CCN1CCC(N2CCN(c3ccccc3OC)CC2)CC1
{#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#}
CCN1CCC(N2CCN(c3ccccc3OC)CC2)CC1
CCN1CCC(N2CCN(c3ccccc3OC)CC2)CC1
1-(1-ethylpiperidin-4-yl)-4-(2-methoxyphenyl)piperazine