COC(=O)C1=C[C@@H](C(=O)OC)[C@@H]2C3=C(C(=O)[C@]2(CC(C)C)NC(=O)c2ccccc2)[C@H](C)n2c(=O)n(-c4ccccc4)c(=O)n2[C@@H]3C1
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.