CO[C@H]1COC(=O)[C@H](C)NC(=O)C/C=C\[C@@H](C)[C@@H](NS(=O)(=O)c2ccc(C)cc2)COC(=O)C/C=C\[C@@H]1C
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?