C[C@@H](CO)N1C[C@@H](C)[C@@H](CN(C)Cc2ccc(C(=O)O)cc2)Oc2cc(/C=C/c3ccccc3)ccc2S1(=O)=O
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?