COc1cc(C#Cc2c(-c3cncn3C)n(C)c3ccc(-c4ccc(OC)c(OC)c4)cc23)cc(OC)c1
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?