1-Piperazineacetic acid, 4-methyl-, (5-nitrofurfurylidene)hydrazide, monohydrochloride 24632-47-1 4-Methyl-1-piperazineacetic acid (5-nitrofurfurylidene)hydrazide hydrochloride 56217-89-1 Nifurpipone hydrochloride