CC(=O)Oc1c2c(c3c(c1CC=C(C)C)O[C@@]14C(=CC5CC1C(C)(C)OC4(C/C=C(\C)C(=O)O)C5=O)C3=O)OC(C)(CCC=C(C)C)C=C2
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?