COc1ccccc1N1C(=O)[C@H]2[C@@H](C1=O)[C@@H]1C=CC=NN1[C@H]2C(=O)c1ccc(OC(C)=O)cc1
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.