Compounds of the formula I in which R1 and R2, independently of one another, each denote H, A, OA, SA or HaI, R3 denotes H or A, R4 denotes A or NH2, R5 denotes H, NH2, NHA or NA2, A denotes alkyl having 1 to 10 carbon atoms, alkenyl, cycloalkyl or alkylenecycloalkyl, Hal denotes F, Cl, Br or I, and their physiologically acceptable salts and/or solvates, as phosphodiesterase VII inhibitors.