Problem statement: Answer the MCQ question.
Question: Which drug has a 2.389\% 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: Fc1cccc(Cl)c1/C=C/c1cnc2ccccc2n1
b: CN1CCN(NC(=O)Nc2cccc(F)c2)CC1
c: Nc1cccc(-c2cnc3ccccc3n2)c1
d: Nc1ncnc(N2CCOCC2)c1N
Answer: d. Nc1ncnc(N2CCOCC2)c1N
{#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#}
Nc1ncnc(N2CCOCC2)c1N
Nc1ncnc(N2CCOCC2)c1N
6-morpholin-4-ylpyrimidine-4,5-diamine