COc1cccc(C(C(=O)NC(C)(C)C)N(C(=O)CCC(=O)Nc2cc(C)on2)c2ccc3c(c2)OCCO3)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?