CC1OC(c2ccc3c(c2O)C(=O)C2=C(C3=O)C3(O)C(=O)CC(C)(O)CC3(O)C=C2)CC(O)C1O
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?