User: I'm searching for the SMILES of a molecule that is not penetrating the blood brain barrier?
Assistant: This is a molecule that is not penetrating the blood brain barrier: C[N+]1(C)CCC(OC(=O)C(O)(c2ccccc2)C2CCCC2)C1.[Br-]
User: I'm {#searching|looking!} for the {SMILES__description} of a molecule that is {penetrate_BBB#not &NULL}{penetrate_BBB__names__adjective}?
Assistant: This is a molecule that is {penetrate_BBB#not &NULL}{penetrate_BBB__names__adjective}: {SMILES#}