COc1ccc(N2C(=O)[C@H]3c4[nH]c5ccccc5c4[C@H]4CCC(C)C[C@H]4[C@H]3C2=O)cc1
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?