O=C1N[C@@H](c2ccccc2)COC(=O)[C@H](Cc2ccc(F)cc2)CC/C=C/C[C@H]1CC(=O)N(CCO)Cc1ccccc1
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?