COc1cc(NC(=O)CC[C@H]2O[C@@H](n3cnc4c(NC(=O)c5ccccc5)ncnc43)[C@H](O)[C@@H]2O)cc(OC)c1OC
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.