Acetic acid (2S,3R,4S,6R)-3-acetoxy-6-((S)-5,12-dihydroxy-6,11-dioxo-3,4,6,11-tetrahydro-1H-2-oxa-naphthacen-4-yloxy)-2-methyl-tetrahydro-pyran-4-yl ester 生成 (4S)-4-[(2R,4S,5S,6S)-4,5-dihydroxy-6-methyloxan-2-yl]oxy-5,12-dihydroxy-3,4-dihydro-1H-naphtho[3,2-g]isochromene-6,11-dione