title: Access of quaternary drugs to the central nervous system.
mesh_terms: D000818:Animals; D002490:Central Nervous System / Q000187:drug effects*; D002800:Cholinesterase Inhibitors / Q000494:pharmacology*; D006168:Guinea Pigs; D010091:Oximes / Q000494:pharmacology*
chemical_list: D002800:Cholinesterase Inhibitors; D010091:Oximes