O=C(Cn1cnnn1)N[C@@H]1C(=O)N2C(C(=O)O)=C(CSc3nncs3)CS[C@H]12 represents a molecule that is not penetrating the blood brain barrier to reach the brain.
{SMILES#} represents a molecule that is {penetrate_BBB#not &NULL}{penetrate_BBB__names__adjective}.