C=CC(C)(C)n1cc(C2=C(O)C(=O)C(c3c(CC=C(C)C)[nH]c4ccccc34)=C(O)C2=O)c2ccccc21
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?