COc1ccc(C[C@H](N)C(=O)N[C@H]2[C@@H](CO)O[C@@H](n3cnc4c(N(C)C)ncnc43)[C@H]2O)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.