Cc1c(OC(=O)c2ccc([N+](=O)[O-])cc2)c2c(c[n+]1C)COC(C)(C)OC2.[I-]
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?