COc1ccc(-c2ccc3[nH]c4c(c3c2)CCN2C[C@H]3[C@H](C)ON(C)[C@H]3C[C@@H]42)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?