COc1ccc2c(c1)O[C@H](c1ccc3c(c1)OCO3)[C@@H](OC(=O)NCCc1ccc(OC)c(OC)c1)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?