CC(=O)O[C@H]1CC[C@H]2[C@@H]3CCC4=C/C(=N/OCCN(C)C)CC[C@]4(C)[C@H]3CC[C@]12C.O=C(O)C(=O)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?