Abstract: Compounds of the formula ##STR1## wherein R.sub.1 and R.sub.1 ', which may be identical to or different from each other, are each hydrogen or alkyl of 1 to 2 carbon atoms;R.sub.2 and R.sub.2 ', which may be identical to or different from each other, are each hydrogen or ##STR2## but other than both hydrogen at the same time, where A is alkylene of 1 to 2 carbon atoms,R.sub.5 is hydrogen, lower alkyl, lower alkylamino-lower alkyl, lower alkoxy-lower alkyl, hydroxycarbonyl-lower alkyl, cycloalkyl of 5 to 8 carbon atoms, lower alkyl-cycloalkyl of 5 to 8 carbon atoms, phenyl or morpholino;R.sub.6 is hydrogen, lower alkyl, lower alkylamino-lower alkyl or lower alkoxy-lower alkyl; orR.sub.5 and R.sub.

Abstract: Compounds of the formula ##STR1## wherein R.sub.1 is hydrogen or alkyl of 1 to 4 carbon atoms;R.sub.2 is hydrogen, methyl or carboxyl; andA is pyridyl, benzodioxanyl or ##STR2## where R.sub.3, R.sub.4 and R.sub.5, which may be identical to or different from each other, are each hydrogen, hydroxyl, alkoxy, alkyl, halogen, carboxyalkyl or nitro, or one of R.sub.3, R.sub.4 or R.sub.5 is dialkylamino, carboxamido, morpholino, piperidino, hydroxy-piperidino, cyano or phenyl;non-toxic salts thereof formed with an inorganic base when R.sub.1 is hydrogen and/or R.sub.2 is carboxyl; and non-toxic addition salts thereof formed with an organic base when R.sub.1 is hydrogen. The compounds are useful as antiallergics.