5-{(1 S 2S)-2-[7-(2,6-Dimethyl-phenyl)-3,3-dimethyl-2,3-dihydro-benzofuran-5-yl]-2-methyl-cyclopropyl}-3-methyl-penta-2E,4E-dienoic acid;(2E,4E)-5-[(1S,2S)-2-[7-(2,6-dimethylphenyl)-3,3-dimethyl-2H-1-benzofuran-5-yl]-2-methylcyclopropyl]-3-methylpenta-2,4-dienoic acid