The invention relates to semicarbazides of the general formula I, ##STR2##
where: R.sup.1 is --(CH.sub.2).sub.n --NH.sub.2, --CON.dbd.C(NH.sub.2).sub.2, --NHC(.dbd.NH)--NH.sub.2 or --C(.dbd.NH)--NH.sub.2, which can also be monosubstituted by --OH, --OCOOA, --OCOO(CH.sub.2).sub.n N(A).sub.2,
The invention relates to compounds of the formula I ##STR2##
in which: R.sup.1 is: phenyl or naphthyl, which is substituted by --C(.dbd.NH)NH.sub.2, that can also be monosubstituted by --COA, --CO--[C(R.sup.7).sub.2 ].sub.n -Ar', --COOA, --OR.sup.7, --OCOA, --OCO--[C(R.sup.7).sub.2 ].sub.n -Ar' or