cas no:80621-81-4||chemical formula:c43h51n3o11||(2s,16z,18e,20s,21s,22r,23r,24r,25s,26r,27s,28e)5,6,21,23-tetrahydroxy-27-methoxy-2,4,11,16,20,22,24,26-octamethyl-1,15-dioxo-1,2-dihydro-2,7-(epoxypentadeca[1,11,13]trienoimino)[1]benzofuro[4,5-e]pyrido[1,2-a]benzimidazol-25-yl acetate
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