1H-Pyrazolo[3,4-b]pyridine-5-carboxylic acid, 1-ethyl-4-[(1-methylethylidene)hydrazino]-, ethyl ester, monohydrochloride 35838-58-5 Etazolate hydrochloride Ethyl 1-ethyl-4-(isopropylidenehydrazino)-1H-pyrazolo[3,4-b]pyridine-5-carboxylate monohydrochloride NSC163611 SQ 20,009 SQ 20009