COc1ccc(C(C(=O)NCC2CCCO2)N(C(=O)CNC(=O)c2cccs2)c2ccc(C(C)=O)cc2)cc1OC
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?