COc1ccc2[nH]c3c(c2c1)CCN1C(=O)N([C@@H](C)C(=O)NCc2ccccc2)C(=O)[C@]31C
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?