2-[(E)-but-2-en-2-yl]-10-[(2R,4S,5S,6S)-4-(dimethylamino)-5-hydroxy-4,6-dimethyloxan-2-yl]-8-[(2R,4R,5S,6R)-4-(dimethylamino)-5-hydroxy-6-methyloxan-2-yl]-11-hydroxy-5-methylnaphtho[2,3-h]chromene-4,7,12-trione 生成 3-[(E)-but-2-en-2-yl]-10-[(2R,4S,5S,6S)-4-(dimethylamino)-5-hydroxy-4,6-dimethyloxan-2-yl]-9-[(2R,3S,4R)-4-(dimethylamino)-3-hydroxy-2-methyl-3,4-dihydro-2H-pyran-6-yl]-11-hydroxy-5-methylnaphtho[2,3-h]chromene-4,7,12-trione