COc1ccc2c(c1OC)c(=O)n1c3ccc(OC(C)C(=O)NCCN4CCOCC4)cc3c3ccnc2c31
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?