COC1=C2CC(C)CC(OC)C(O)C(C)/C=C(\C)C(OC(N)=O)C(OC)/C=C\C=C(/C)C(=O)NC(=C(/C=N/C(C)(C)C)C1=O)C2=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?