Benzimidazolo-quinazolines

A benzimidazolo-quinazoline of the formula ##STR48## in which Y.sub.2 denotes a radical of the formula ##STR49## Y.sub.3 denotes hydrogen or C.sub.1 -C.sub.4 -alkyl, X.sub.5 and X.sub.6, independently of one another, denote C.sub.1 -C.sub.6 -alkyl which may be substituted by halogen, C.sub.1 -C.sub.4 -alkoxy or cyano, cyclopentyl or cyclohexyl, each of which may be substituted by 1-4 C.sub.1 -C.sub.4 -alkyl radicals, or denote phenyl, benzyl or phenethyl, each of which may be substituted by 1 or 2 C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, halogen, nitro, cyano or C.sub.1 -C.sub.4 -alkoxycarbonyl radicals, or X.sub.5 and X.sub.6, together with the nitrogen atom connecting them, denote a pyrrolidine, piperidine or morpholine radical which may be substituted by C.sub.1 -C.sub.4 -alkyl,

• X.sub.7 denotes hydrogen, halogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or C.sub.1 -C.sub.4 -alkoxycarbonyl,
• X.sub.8 denotes hydrogen, halogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy,
• X.sub.9 denotes C.sub.1 -C.sub.4 -alkyl or phenyl, or 2 radicals X.sub.9, which are both located on the same C atom, together denote trimethylene or tetramethylene,
• a denotes 0 or 1-4, and
• Z.sub.1 denotes hydrogen, C.sub.1 -C.sub.8 -alkyl which may be substituted by halogen, cyano or C.sub.1 -C.sub.4 -alkoxy, benzyl or phenethyl, each of which may be substituted by halogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy,
• m denotes 0 or 1,
• in which a double bond is located between the positions labelled with 1 and 2 when m=0 and a single bond is between these positions when m=1, and in which the rings A.sub.1 and B.sub.1 may be substituted by one or two radicals selected from cyano, halogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, NX.sub.5 X.sub.6, phenyl or benzyl.