5-[4-(5-acetyl-5-hydroxy-4-methoxy-6-methyl-oxan-2-yl)oxy-6-(acetyloxy methyl)-3-hydroxy-5-[(Z)-2-isothiocyanatobut-2-enoyl]oxy-oxan-2-yl]-2- amino-5-hydroxy-3,6-dioxo-cyclohexene-1-carboxylic acid