4-Methylcarbamoyl-3-oxo-butyric acid methyl ester 、
4-[2-(8-chloro-5-methoxy-4-oxo-1,2,3,4-tetrahydro-naphthalen-2-yl)-ethylidene]-2-phenyl-4H-oxazol-5-one 生成 (4R,4aS,5aS,12aS)-4-Benzoylamino-7-chloro-3,12-dihydroxy-10-methoxy-1,11-dioxo-1,4,4a,5,5a,6,11,12a-octahydro-naphthacene-2-carboxylic acid methylamide