Task: Please answer the multiple choice question.
Question: Which molecules are not penetrating the blood brain barrier?
Constraint: You must select none, one or more options from a, b, or c without using any other words.
Options:
a.) Nc1nc(N)c2nc(-c3ccccc3)c(N)nc2n1
b.) O=c1[nH]oc2c1CCNC2
c.) CCC(=O)N(c1ccccc1)C1(COC)CCN(CCc2cccs2)CC1
Answer: a
Task: Please answer the multiple choice question.
Question: Which molecules are {penetrate_BBB#not &NULL}{penetrate_BBB__names__adjective}?
Constraint: You must select none, one or more options from {%multiple_choice_enum%2-5%aA1} without using any {#other|additional!} words.
Options:
{SMILES%penetrate_BBB%}
Answer: {%multiple_choice_result}