COc1ccc(C2CC(=O)c3cc(-c4nc(-c5cccc([N+](=O)[O-])c5)cs4)c(=O)n(-c4ccc(OC)cc4)c3C2)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.