C=CC[C@@H]1C=C[C@@H](O/N=C\C[C@@H]2C=C[C@H](OC(C)=O)[C@H](COC(C)=O)O2)[C@@H](CO)O1
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?