COc1ccc(CN(C)[C@H]2C[C@H]3c4[nH]c5ccccc5c4CCN3C[C@H]2[C@H](C)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?