Task: Please answer the multiple choice question.
Question: Which molecules are penetrating the blood brain barrier?
Constraint: You must select none, one or more options from a, b, c, or d without using any other words.
Options:
a CNCCC=C1c2ccccc2C2CC2c2ccccc21
b O=C1CCCN1CCCCN1CCN(c2cc(C(F)(F)F)ccn2)CC1
c O=[N+]([O-])C1=CC=NC1NCCSCc1ncccc1Br
d CN1CCN(C(=O)OC2C3=C(SCCS3)C(=O)N2c2ccc3ccc(Cl)nc3n2)CC1
Answer: a, b, c, d
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}