Compounds having analgesic and/or immunostimulant activity
The compounds shown by their structural formulas in the specification have analgesic and or immunostimulant activity in mammals.
1. A compound of the formula
where R 4 is H, alkyl of 1 to 6 carbons or CO—R 5 where R 5 is alkyl of 1 to 6 carbons or any other pharmaceutically acceptable salt of said compound.
2. A compound in accordance with claim 1 where R 4 is H.
3. A method of treating pain in a mammal in need of such treatment, comprising administering to said mammal the compound in accordance with claim 1 or any other pharmaceutically acceptable salt of said compound.
4. A pharmaceutical composition comprising the compound of claim 1 or any other pharmaceutically acceptable salt of said compound and a pharmaceutically acceptable excipient.