context: They are semi-natural opiates that are either a primary drug for morphine or very similar to morphine since they are not semi-synthetic, but they are found more naturally in nature since they are morphine salts. Examples of this type of medicine include diacetylmorphine (a morphine primary drug, known as morphine diacetate or heroin), and a methyl monoxide metabolite-morphine-6 ​​(6-MAM) (a precursor to morphine), nicomorphine (dicotenyl morphine), and diatylin Morphine propanol (morphine dipropionate), desomorphine (dihydroxyzoxine morphine), methyl desorphine, acetylpropenyl morphine, morphine benzoyl, diacetyl dihydro morphine, and many other types. [7]
question: What are morphine esters?
answers.text: semi-natural opiates that are either a primary drug for morphine or very similar to morphine