O=C(N[C@H]1C/C=C\C[C@@H](CC(=O)N(CCO)Cc2ccccc2)C(=O)N2CCC[C@H]2COC1=O)OCC1c2ccccc2-c2ccccc21
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?