Hoechst Aktiengesellschaft

Gerhard Burghardt

Volker Koch

The compounds of the formula I ##STR1## in which R.sub.1 to R.sub.5 denote hydrogen; alkyl, alkoxy, alkylmercapto, alkylsulfinyl, alkylsulfonyl, alkylsulfonyloxy each of which can be halogenated, halogen or nitro, R.sub.6 to R.sub.10 denote hydrogen; alkyl, alkoxy, alkenyloxy, alkylmercapto, alkenylmercapto, alkylsulfonyl or C.sub.3 -hydroxyalkyl each of which can be halogenated, (substituted) benzyloxy, alkoxycarbonyl or NRR', and R.sub.7 and R.sub.8 together can form a (substituted) alkylenedioxy radical,

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Hofheim am Taunus, Germany

Gerhard Burghardt