CC(=O)NC1C(OCc2ccccc2)OC(CO)C(O)C1OCC(=O)N[C@@H](C)C(=O)N[C@H](CCC(=O)NCCCNc1c2ccccc2nc2cccc([N+](=O)[O-])c12)C(N)=O
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?