2-Ethyl-4-hydroxybutyric acid (5-nitrofurfurylidene)hydrazide 91338-37-3 BUTYRIC ACID, 2-ETHYL-4-HYDROXY-, (5-NITROFURFURYLIDENE)HYDRAZIDE M & B 5793 N-(5-Nitrofurfurylidene)-2-ethyl-4-hydroxybutyric acid hydrazide