Task: Answer the MCQ question.
Question: What is the hERG inhibition at a concentration of 1uM of a compound with the SMILES CCCCn1c(=O)[nH]c(=O)c2c1nc(-c1ccc(CC)c([N+](=O)[O-])c1)n2C?
Constraint: You must return none, one or more options from a or b without using any additional words.
Options:
(a) 21.269
(b) 6.840
Answer: b. 6.840\%.
{#Task|Problem statement!}: Answer the {#multiple choice|multiple-choice|MCQ!} question.
{#Question|Query!}: What is the {herg_central_at_1uM__names__noun} of a {#compound|drug!} with the {SMILES__description} {SMILES#}?
Constraint: You must return none, one or more options from {%multiple_choice_enum%2-5%aA1} without using any {#other|additional!} words.
Options:
{herg_central_at_1uM%SMILES%}
Answer: {%multiple_choice_result}. {herg_central_at_1uM#}{herg_central_at_1uM__units}.
CCCCn1c(=O)[nH]c(=O)c2c1nc(-c1ccc(CC)c([N+](=O)[O-])c1)n2C
CCCCn1c(=O)[nH]c(=O)c2c1nc(-c1ccc(CC)c([N+](=O)[O-])c1)n2C
3-butyl-8-(4-ethyl-3-nitrophenyl)-7-methylpurine-2,6-dione