O=C(Nc1nc2ncn(CCNCCn3cnc4nc(NC(=O)c5ccccc5)[nH]c(=O)c43)c2c(=O)[nH]1)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?