CNC1C(O)C(OC2C(N)CC(N)C(OC3OC(C(C)O)C(O)C(O)C3N)C2O)OCC1(C)O.O=S(=O)(O)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?