O=C(Cn1c(=O)n(-c2ccccc2)c(=O)c2ccc(C(=O)NCc3ccc4c(c3)OCO4)cc21)Nc1ccc(Br)cc1F
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?