Oh - well thanks for that. I presumed it would rapidly be hydrolized but not sure how much. If it's more potent then at least some of it is available orally.
I noted that dipropenyl morphine was the OG 'designer drug' in the 1930s.
Yeah - DBM was tested in UK hospitals. No clinical advantage BUT it would not have required quite the stringent paperwork use of H brings.
Now dipropenyl morphine would really be interesting to know about. About as rare as hens teeth, I reckon.