Task: Please answer the multiple choice question.
Question: Which molecules are not a hERG blocking compound?
Constraint: You must select none, one or more options from a or b without using any other words.
Options:
a. O=C(CC1SC(=NCCc2ccccc2)N(/N=C/c2cccs2)C1=O)Nc1ccc(Cl)cc1
b. CCOc1ccc(CSC2=NCCN2)cc1[N+](=O)[O-].Cl
Answer: a
Task: Please answer the multiple choice question.
Question: Which molecules are {herg_inhib#not &NULL}a {herg_inhib__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_inhib%}
Answer: {%multiple_choice_result}