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(4S,5S)-4-[(5S,6R,7S,8S)-7-Formyl-2,2,7-trimethyl-8-phenylmethoxy-1,3-dioxaspiro[4.5]dec-9-en-6-yl]-6,6,8-trimethyl-2-oxo-1,3-dioxaspiro[4.5]dec-7-ene-7-carbaldehyde


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