COc1ccc2[nH]c3c(c2c1)CCN1C(=O)N([C@@H](C)C(=O)NC2CCN(Cc4ccccc4)CC2)C(=O)[C@]31C
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.