(1R,2R,4S)-2-乙基-2,4,5,7,9-五羟基-6,11-二氧代-3,4-二氢-1H-并四苯-1-羧酸甲酯 生成 methyl (1R,2R,4S)-4-[(2R,4S,5S)-4-(dimethylamino)-5-[(2S,4S,5S,6S)-4-hydroxy-6-methyl-5-[(2S,6S)-6-methyl-5-oxooxan-2-yl]oxyoxan-2-yl]oxy-5-methyloxan-2-yl]oxy-2-ethyl-2,5,7,9-tetrahydroxy-6,11-dioxo-3,4-dihydro-1H-tetracene-1-carboxylate