C[C@@]12CCC(=O)C=C1CC[C@@H]1[C@@H]3CC[C@H](C(=O)Cn4cnc5c(S)ncnc54)[C@]3(C)CC[C@H]12
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.