for the following products
(-)-6-Aminophenyl-4,5-dihydro-5-methyl-3-(2H)pyridazinone | (5R)-6-(4-Aminophenyl)-5-methyl-2,3,4,5-tetrahydropyridazin-3-one | (R)-3(2H)pyridazinone-6-(4-aminophenyl)-4,5-dihydro-5-methyl and (R)-6-(4-Aminophenyl)-4,5-dihydro-5-methyl-3-(2H)-pyridazinone
