CC(=O)OC[C@]12CC[C@@H]3[C@@]4(C)CCCC(C)(C)[C@@H]4CC[C@@]3(C)[C@@H]1C[C@H](C1=CC(=O)O[C@H]1OC(C)=O)O2
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?