COC(=O)Cn1c(=O)c2c(n(Cc3ccccc3)c1=O)=N/C(=C/c1ccc(Br)cc1)C=2O
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?