O=CC1C[C@@H](N2C(=O)O[C@@H](c3ccccc3)[C@H]2c2ccccc2)[C@@H]1COCc1ccccc1
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?