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M 5140 (OTTO) Methyl carbazate, 97% Cas 6294-89-9 - used in the preparation of methyl 3-(4-methyl-benzyl-idene)carbazate. M 5140 (OTTO) Methyl carbazate, 97% Cas 6294-89-9 - used in the synthesis of imidazo[1,5-d][1,2,4]triazines.