COc1cc(C(c2c(O)c3ccccc3oc2=O)c2c(C)n(C)n(-c3ccccc3)c2=O)ccc1OCC(=O)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?