COc1ccc2[n-]c([S+]([O-])Cc3ncc(C)c(OC)c3C)nc2c1.COc1ccc2[n-]c([S+]([O-])Cc3ncc(C)c(OC)c3C)nc2c1.[Mg+2]
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?