CCOC(=O)c1c(C)[nH]c(C(=O)COC(=O)c2[nH]c(C)c(C(C)=O)c2C)c1C
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?