COC(=O)C1=C(C(=O)OC)[C@@H]2N(C)c3ccc(OC)cc3[C@@]23C[C@@H](C(=O)OC)N(C(=O)CC(C)C)C3=N1
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.