[3-(2-Chloro-phenyl)-6-oxo-6H-pyridazin-1-yl]-acetic acid [3-(2-chlorophenyl)-6-oxopyridazin-1(6H)-yl]acetic acid [3-(2-Chlorophenyl)-6-oxopyridazin-1(6H)-yl]acetic acid; . [3-(2-Chlorophenyl)-6-oxopyridazin-1(6H)-yl]aceticacid 2-(3-(2-chlorophenyl)-6-oxopyridazin-1(6H)-yl)acetic acid 2-[3-(2-chlorophenyl)-6-oxo-1,6-dihydropyridazin-1-yl]acetic acid 2-[3-(2-chlorophenyl)-6-oxo-1,6-dihydropyridazin-1-yl]aceticacid 2-[3-(2-chlorophenyl)-6-oxopyridazin-1-yl]acetic acid