CC(C)(C)OC(=O)N1O[C@H]2C[C@@H]1[C@@H]1[C@@H]2N=NN1C12C[C@H]3C[C@@H](C1)C[C@@H](C2)C3
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?