New heterocyclylcarboxylic acid derivatives which are acylated in the nucleus, especially benz-acyl-benzimidazole-2-carboxylic acid derivatives of the formula ##STR1## in which R is a free, esterified or amidated carboxyl group or a free, etherified or esterified hydroxymethyl group, R.sub.1 is an aliphatic, cycloaliphatic, aromatic, araliphatic, heterocyclic or heterocyclic-aliphatic radical, R.sub.2 is hydrogen or an aliphatic radical and Ph is a 1,2-phenylene group containing the radical R.sub.1 --C(.dbd.O)--, with the proviso that R.sub.1 contains at least 2 carbon atoms if Ph is otherwise unsubstituted, R.sub.2 is ethyl and R is acetoxymethyl, and salts of such compounds having salt-forming properties, are useful as anti-allergic agents.
新的杂
环羧酸衍
生物在核中被酰化,特别是公式##STR1##中的苯乙酰
苯并咪唑-2-
羧酸衍
生物。其中R是自由的,酯化的或酰胺化的羧基或自由的,醚化的或酯化的羟甲基基团,R.sub.1是脂肪,环脂肪,芳香,芳基脂肪,杂环或杂环-脂肪基团,R.sub.2是氢或脂肪基团,Ph是含有基团R.sub.1--C(.dbd.O)--的1,2-苯基烷基团,前提是如果Ph否则未取代,则R.sub.1至少含有2个碳原子,R.sub.2为乙基,R为乙酰氧甲基,以及具有成盐性质的这些化合物的盐,可用作抗过敏剂。