COCC1=C2c3ccccc3[C@H](C[N+](=O)[O-])C(C(=O)OC)(C(=O)OC)C[C@@H]2n2c(=O)n(-c3ccccc3)c(=O)n2C1
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?