COc1cc2c3cc1Oc1c(OC)c(OC)cc4c1C(=NCC4)Cc1ccc(cc1)Oc1cc(ccc1O)C[C@H]3N(C)CC2
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.