COC(=O)CNC(=O)C(CSC(=O)OCC1c2ccccc2-c2ccccc21)NC(=O)CCC(NC(=O)OCC1c2ccccc2-c2ccccc21)C(=O)OC
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?