CCC1=C2CC[C@H]3C(=O)N(C)C(=O)[C@H]3[C@H]2[C@@]2(Cc3ccccc3)/C(=N/CC3CC3)OC(=O)N2C1=O
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.