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In page Morphine:
"Most of the licit morphine produced is used to make codeine by methylation.[1] It is also a precursor for many drugs including heroin (3,6-diacetylmorphine), hydromorphone (dihydromorphinone), and oxymorphone (14-hydroxydihydromorphinone).[2] Most semi-synthetic opioids, both of the morphine and codeine subgroups, are created by modifying one or more of the following:[citation needed]
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