S=C(Nc1ccccc1)Nc1ccccc1SC(/C=C/NNC1=NN=C(c2ccccc2)C(c2ccccc2)N1)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?