COc1cc(C2c3c(-c4cc(C)ccc4O)n[nH]c3C(=O)N2Cc2cccnc2)cc(OC)c1OC
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?