C[C@H](OC(=O)N1CCN(C(c2ccccc2)c2ccccc2)CC1)[C@@H]1O[C@@]2(C)CCC[C@H]1O2
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?