| abstract |
There are described compounds of formula Iin which X is -CN, -CONH<sub>2</sub>, -CSNH<sub>2</sub>,or -CO<sub>2</sub>R<sub>3</sub>R is H or alkyl C 1 to 8,R, and R<sub>3</sub>, which may be the same or different, are each alkyl C 1 to 8, andR<sub>2</sub> is H or alkanoyl C 2 to 8,and the pharmaceutically acceptable acid addition salts thereof.There are also described processes for producing the compounds, and pharmaceutical, e.g. immunoregulant and antitumor, compositions containing them. |