D-Streptamine, O- 2-deoxy-2-(methylamino)-alpha-L-glucopyranosyl-(1-2)-O-5-deoxy-3-C-formyl-alpha-L-lyxofuranosyl-(1-4)-N,N'-bis(aminoiminomethyl)-, sulfate (2:3) (salt), mixt. with 4-amino-N-(4,6-dimethyl-2-pyrimidinyl)benzenesulfonamide, 4-amino-N-2-pyrimidinylbenzenesulfonamide and 4-amino-N-2-thiazolylbenzenesulfonamide