CN1CCN(/C=C2\N=C3CN=C(c4ccccc4Cl)c4cc([N+](=O)[O-])ccc4N3C2=O)CC1 represents a molecule that is penetrating the blood brain barrier to reach the brain.
{SMILES#} represents a molecule that is {penetrate_BBB#not &NULL}{penetrate_BBB__names__adjective}.