COc1ccc2c(c1)OC(c1ccc3c(c1)OCO3)C(OC(=O)Nc1ccc(OC(F)F)cc1)C2=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?