Acetyldihydrocodeine, a narcotic opiate derivative that was used in Germany as an analgesic. This drug has never been marketed in the USA.

Acetyldihydrocodeine:
https://drugs.ncats.io/drug/SGY1T84P34

An opioid derivative of low to moderate strength, it was discovered in Germany in 1914 and was used as a cough suppressant and pain reliever. It is not commonly used, but has activity similar to other opiates. Acetyldihydrocodeine is a very close relative derivative of thebacon. More potent and longer-lasting than codeine.