Methyldihydromorphine is a synthetic narcotic analgesic related to the morphine. This compound has no pharmaceutical value in the US.

Methyldihydromorphine:
https://drugs.ncats.io/drug/26AY9TLO5W

a semi-synthetic opioid originally developed in Germany in 1936. This compound is a derivative of hydromorphone It has been found to be 33 per cent the analgesic potency of morphine with a substantially longer duration of action. So far, little is currently known about this compound.