N#CC(NNC(=O)c1c(Cl)c(Cl)c(Cl)c(Cl)c1-c1nc2cc(C(=O)c3ccccc3)ccc2[nH]1)c1ccccc1
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?