Explanatory notes
… its salts 2933.33 - - Alfentanil (INN), anileridine (INN), bezitramide (INN), bromazepam (INN), carfentanil (INN), … diphenoxylate (INN), dipipanone (INN), fentanyl (INN), ketobemidone (INN), methylphenidate (INN), pentazocine … a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure : 2933.52 - - Malonylurea …