CCOCC(=O)N[C@H]1CCc2cc(OC(=O)COCC)c(OC)c(OC)c2-c2ccc(SC)c(=O)cc21
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?