| http://www.w3.org/ns/prov#value | - We have now found that tetracyclic quinazoline derivatives of the formula I ##STR2## where A is C2-4 -alkylene which may be substituted by C1-4 -alkyl and in which 2 adjacent methylene groups may additionally be closed to a ring via a C3 -C5 -alkylene group which may be substituted by C1-4 -alkyl, X is a phenyl or naphthyl ring which may be substituted by halogen, nitro, amino, C1-4 -alkylamino, s
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