Sandoz Gmbh

Hellmuth Reinshagen

Helmut Egger

Gerd Ascher

Hans Nesvadba

This invention relates to new pleuromutilins of the formula: ##STR1## wherein either R.sub.1 is ethyl or vinyl,

Substituted 14-desoxy-mutilin compositions

Pleuromutilin esters

This invention relates to new pleuromutilins of the formula: ##STR1## wherein EITHER

Certain pleuromulilin ester derivatives

The invention provides novel 5-nitrothiazolylimidazoline derivatives, useful as chemotherapeutic agents.

Certain 5-nitrothiazolylimidazolidine compounds

This invention provides novel 5-nitrothiazolo-2-imidazoles which are useful as chemotherapeutical agents.

1-(5-Nitrothiazolyl-2)-3-(piperazinomethyl)-imidazolidinones-2 and

Basically substituted imidazolyl-2-quinazolines of the formula ##STR1## where R.sub.1 is hydrogen, lower alkyl or halogen;

Imidazolyl-2-quinazoline derivatives

This invention relates to new pleuromutilins of the formula: ##STR1## wherein EITHER R.sub.1 is ethyl or vinyl,

Certain pleuromutilins

This invention provides compounds of the formula, ##STR1## in which R.sub.1 signifies straight or branched chain alkyl in which a single methyl group is replaced by a mono-, di- or tri-halomethyl group; R.sub.2 signifies hydrogen or straight or branched chain lower alkyl and X and Z each independently signifies oxygen or sulphur, which are useful as animal feed additives and amoebicidal agents.

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Vienna, Austria

Hellmuth Reinshagen