Methyl 4-hydroxy-6-oxo-1-[3-(trifluoromethyl)-phenyl]-1,6-dihydro-3-pyridazinecarboxylateMethyl 1,6-dihydro-4-hydroxy-6-oxo-1-[3-(trifluoromethyl)phenyl]pyridazin-3-carboxylate 97%methyl 4-hydroxy-6-oxo-1-[3-(trifluoromethyl)phenyl]-1,6-dihydro-3-pyridazinecarboxylate