6-(4-methoxyphenyl)-4-(thiophen-2-ylmethyl)-2H-pyridazin-3-one 6-(4-methoxyphenyl)-4-(2-thienylmethyl)-2H-pyridazin-3-one 6-(4-Methoxyphenyl)-4-(2-thienylmethyl)-3-pyridazinol AIDS-133315 AIDS133315 NSC628695 NCI60_009296