Diaminopyrazol derivative of the general formula (II) ##STR6## wherein R5 is a benzyl group, R6 and R8 are each independently selected form the group consisting of hydrogen, alkyl with 1 to 4 carbon atoms, hydroxyalkyl with 2 to 4 carbon atoms, benzyl and phenyl, and R7 is selected from the group consisting of hydrogen, alkyl with 1 to 4 carbon atoms and hydroxyalkyl with 2 to 4 carbon atoms, with