COc1cc2c(=O)n(-c3ccc(C)cc3)c(=O)n(CC(=O)c3ccc4c(c3)OCO4)c2cc1OC
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?