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(S)-4beta-[[(4S)-4,4Aalpha,6,7,8,8aalpha-Hexahydro-4alpha-[(ethoxycarbonyl)amino]-7,7-dimethyl-8alpha-methoxypyrano[3,2-d]-1,3-dioxin]-6alpha-ylmethyl]-1,3-dioxolane-2-one


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