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(2S,8Z,16S,17S,18R,19R,20R,21S,22R,23S,24E)-5,6,17,19-tetrahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1,9,11-trioxo-8-[(pyridin-2-ylamino)methylidene]-1,2,8,9-tetrahydro-2,7-(epoxypentadeca[1,1 related products: