A new metabolite of maleic hydrazide (MH; 1,2-dihydro-3,6-pyridazinedi
one) was isolated from MH-treated tobacco (Nicotiana tabacum L.) plant
s. The purified metabolite was identified as MH-N-beta-D-glucoside by
means of TLC, FAB-MS, H-1-NMR, and C-13-NMR analyses.