Showing structure for n-{[(9z)-7-[(1-acetylaziridin-2-yl)(hydroxy)methyl]-9-(1,3-dioxobutan-2-ylidene)-3,11-dihydroxy-2-methyl-4-oxo-1,5,8-trioxa-10-azaspiro[5.5]undec-10-en-2-yl]methyl}-3-methoxy-5-methylnaphthalene-1-carboximidic acid