Alfentanil (INN), anileridine(INN), bezitramide (INN), bromazepam (INN), difenoxin(INN), diphenoxylate (INN), dipipanone(INN), fentanyl (INN), keto bemidone (INN), methylphenidate (INN), pentazocine (INN), pethidine(INN), pethidine intermediate A, phencyc lindine (INN) (PCP), phenoperidine (INN), pipradrol (INN), piritramide (INN), propiram (INN) and trimeperidine (INN; salts thereof.