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3-Methyl-2-pyrazolin-5-one108-26-9100 % similar 4,5-Dihydro-6-methyl-3(2H)-pyridazinone5157-08-461 % similar 2,4-Pentanedione oxime2157-56-438 % similar N-Methylacetoacetamide20306-75-633 % similar 2-Methyl-4,6-pyrimidinedione40497-30-132 % similar Malonic dihydrazide3815-86-932 % similar 5-Amino-2,4-dihydro-3H-pyrazol-3-one6126-22-331 % similar 2,5-Diketopiperazine106-57-030 % similar 1,2-Diacetylhydrazine3148-73-030 % similar