4H-Imidazo[4,5-d]pyridazin-4-one,2-butyl-5-(3,3-dimethyl-2-oxobutyl)-3,5-dihydro-3-[[2'-[1-(triphenylmethyl)-1H-tetrazol-5-yl][1,1'-biphenyl]-4-yl]methyl]-
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