N=c1c2c(=S)n(-c3ccccc3)c(=S)n(-c3ccccc3)c2nc(SCCCN2CCN(c3cccc(Cl)c3)CC2)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?