1-Ethyl-4-isopropylidenehydrazino-1H-pyrazolo[3,4-b]-1-pyridine-5-carboxylic Acid Ethyl Ester | 1-Ethyl-4-(2-isopropylidenehydrazino)-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid ethyl ester |
1-Ethyl-4-isopropylidenehydrazino- 1H-pyrazolo[3,4-β]-1-pyridine-5-carboxylic Acid Ethyl Ester | 1-Ethyl-4-[2-(1-methylethylidene)hydrazinyl]-1H-pyrazolo[3,4-b]pyridine-5-carboxylic Acid Ethyl Ester |