Nc1ccc2c3c1cccc3c(=O)n1c3ccc(Cc4ccc5c(c4)nc4c6ccc(N)c7cccc(c(=O)n54)c76)cc3nc21
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?