CCCNC1=C(C)C(=O)C2=C(C1=O)[C@H](COC(N)=O)[C@]1(OC)[C@@H]3N[C@@H]3CN21
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?