Cc1cc2c(c(C(=O)NCCC(=O)O)c1)Oc1c(cc(C)cc1C(=O)NCCC(=O)O)S2
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?