O=C(/C=C/c1ccc(O)c(O)c1)OC1C(O)CC(OC(=O)/C=C/c2ccc(O)c(O)c2)(C(=O)O)CC1O
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?