COc1ccc(NC(=O)Nc2cccc3c2O[C@@H](CN(C)CC2CCCCC2)[C@@H](C)CN([C@H](C)CO)C3=O)cc1
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?