Cc1nn(C)c(C(=O)Nc2c(C)nn(Cc3c(F)c(F)c(F)c(F)c3F)c2C)c1Br
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?