O=C1c2cccnc2C(=O)c2c1nc1ccccc1c2-c1ccc2c3c(nc4ccccc42)C(=O)c2cccnc2-c13
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?