1,3-DIOXOLANE-2-CARBOXYLIC ACID, 2-METHYL-, (5-NITROFURFURYLIDENE)HYDRAZIDE 2-Methyl-1,3-dioxolane-2-carboxylic acid (5-nitrofurfurylidene)hydrazide 91687-60-4 M & B 6480 N-(5-Nitrofurfurylidene)pyruvic acid hydrazide ethylene glycol ketal