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2-Hydroxy-7-methoxy-5-methyl-1-naphthalenecarboxylic acid [2,3,8,9-tetradehydro-1abeta-(2-oxo-1,3-dioxolan-4beta-yl)-7beta-hydroxy-1a,5,6,9abeta-tetrahydro-7H-6alpha,6aalpha-epoxycyclopenta[5,6]cyclonon[1,2-b]oxiren]-5beta-yl ester


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