CS(=O)(=O)Nc1ccc2c(c1)[C@@H]1C[C@@H](CC(=O)NCc3cccnc3)O[C@H](CO)[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?