Nc1nc(O)c2ncn([C@@H]3O[C@H](CNCc4ccc(OCCCN5CCOCC5)cc4)[C@@H](O)[C@H]3O)c2n1
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?