Cc1c(CCOC(=O)C23CC4(C)CC(C)(CC(C)(C4)C2)C3)sc[n+]1CC(=O)c1ccccc1.[Br-]
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?