Hoffmann-la Roche Inc.

Hans H Keller

Rene Imhof

Compounds of the formula ##STR1## wherein R.sup.1 is hydrogen; lower-alkyl, unsubstituted or substituted by hydroxy, lower-alkoxy, cyano, halogen, lower-alkoxycarbonyl, aminocarbonyl, substituted benzoyl or substituted .alpha.-hydroxybenzyl; lower-alkenyl; cycloalkyl; cycloalkyl-lower-alkyl; heteroaryl-lower-alkyl; or aryl-lower-alkyl, unsubstituted or substituted by hydroxy, lower-alkoxy, lower-alkyl or halogen, and R.sup.2 is hydrogen or lower-alkanoyl,

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Basel, Switzerland

Hans H Keller