Synonyms: BRN 0640041;1,2-Trimethylene-3-methyl-4-ethylpyrazolone-5;1H,5H-Pyrazolo(1,2-a)pyrazol-1-one, 6,7-dihydro-2-ethyl-3-methyl-;6,7-Dihydro-2-ethyl-3-methyl-1H,5H-pyrazolo(1,2-a)pyrazol-1-one;AC1MI8QG;LS-129135;6-ethyl-7-methyl-2,3-dihydro-1H-pyrazolo[1,2-a]pyrazol-5-one;51938-04-6