C#CCOCCOCCOCCNc1nc(N2CCOCC2)nc(N2CCN(C(=O)[C@H](Cc3cc4ccccc4[nH]3)n3cc([C@@H](N)Cc4ccc(O)cc4)nn3)CC2)n1.Cl
Molecules with a polar surface area of greater than 140 angstroms squared (Å2) tend to be poor at permeating cell membranes. What's the psa of this molecule?