Retinoic acid metabolites. 2. Total synthesis of rac-(2E,4E,6E,8E)-3,7-dimethyl-9-(6-carboxy-2,6-dimethyl-3-oxo-1-cyclohexen-1-yl)-2,4,6,8-nonatetraenoic and rac-(2E,4E,6E,8E)-3,7-dimethyl-9-AD2,6-dmethyl-6-(hydroxymethyl)-3-oxo-1-cyclo hexen-1-yBD-2,4,6,

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