4-((3,4-Dimethyl-1H-pyrazolo[3,4-d]pyridazin-7-yl)methyl)phenyl methyl ether 63195-23-3 7-(4-Methoxybenzyl)-3,4-dimethyl-1H-pyrazolo[3,4-d]pyridazine AIDS-128659 AIDS128659 NSC294163