Compounds of the general formula ##STR1## wherein R.sup.1 is hydrogen, halogen or OR.sup.5 ; R.sup.2 is hydrogen, lower-alkyl lower-alkoxy or halogen; R.sup.3 and R.sup.4 each independently are lower-alkyl or taken together are alkylene with 3-5 C atoms in a straight-chain; R.sup.5 is hydrogen, acyl, lower-alkoxycarbonyl, lower-alkyl, amino-lower-alkyl, mono-alkylamino-lower-alkyl di-alkylamino-lower-alkyl or a N-containing 5-8-membered saturated or unsaturated monocyclic heterocyclic ring which is attached via a N atom to lower alkyl; and M signifies --CONH-- or --NHCO--, which can be used as medicaments, e.g., for the treatment of neoplasms and dermatological indications of an inflammatory and allergic nature.