CC[C@@]1(OC(=O)CCC(=O)[O-])C(=O)OCc2c1cc1n(c2=O)Cc2cc3ccccc3nc2-1.[Na+]
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?