CS(=O)(=O)CC1=Nc2nnc(CCCCCCCc3nnc4n3C(=O)C(CS(C)(=O)=O)=N4)n2C1=O
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?