1-Diketobutyryl-1-phenyl-2-methyl-2-nitrosohydrazide 1-Diketobutyryl-1-phenyl-2-methyl-2-nitrosohydrazide hydrate 2,3-Dioxobutyric acid 2-methyl-2-nitroso-1-phenylhydrazide hydrate 76149-21-8 BUTYRIC ACID, 2,3-DIOXO-, 2-METHYL-2-NITROSO-1-PHENYLHYDRAZIDE, HYDRATE DPMN