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(16E)-(1S,2S,13S,18R,19aR,19bR)-19a,19b-dimethoxy-2-methoxymethyloxy-13,19a,19b-trimethyl-14,19,20-trioxabicyclo[16.4.0]doicosa-4,16-diene-15-one
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(16E)-(1S,2R,13S,18R,19aR,19bR)-19a,19b-dimethoxy-2-methoxymethyloxy-13,19a,19b-trimethyl-14,19,20-trioxabicyclo[16.4.0]doicosa-16-ene-15-one
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(16E)-(1S,2S,13S,18R,19aR,19bR)-19a,19b-dimethoxy-2-methoxymethyloxy-13,19a,19b-trimethyl-14,19,20-trioxabicyclo[16.4.0]doicosa-16-ene-15-one
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