乙酸酐 、
在
吡啶 、
4-二甲氨基吡啶 作用下,
生成 5-[18-[5-[N-(3-acetyloxyphenyl)-C-hydroxycarbonimidoyl]-2,7-ditert-butyl-9,9-dimethylxanthen-4-yl]-6,8,17,19-tetraoxo-7,18-diazaheptacyclo[14.6.2.22,5.03,12.04,9.013,23.020,24]hexacosa-1(23),2,4,9,11,13,15,20(24),21,25-decaen-7-yl]-2,7-ditert-butyl-N-[2-[[hydroxy-[(2-methylpropan-2-yl)oxy]methylidene]amino]ethyl]-9,9-dimethylxanthene-4-carboximidic acid