C[C@]12CCC3[C@@H](CC=C4C[C@@H](OC(=O)Nc5ccccc5)CC[C@@]43C)C1CC/C2=N\OC(=O)Nc1ccccc1
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.