C[C@]12CC[C@H]3[C@@H](CCC4=C[C@@H](N5CCCC5)CC[C@@]43C)[C@@H]1C/C(=C\c1ccncc1)[C@@H]2O
PSA is a commonly used medicinal chemistry metric for the optimization of a drug's ability to permeate cells. Please predict psa of this molecule.