乙酸酐 、
(4S,5S,6S)-4-Carboxymethyl-5-((S)-1-hydroxy-ethyl)-6-((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-hydroxymethyl-tetrahydro-pyran-2-yloxy)-5,6-dihydro-4H-pyran-3-carboxylic acid methyl ester 在
吡啶 作用下,
生成
kungiside tetraacetate 、 (4S,5S,6S)-5-((S)-1-Acetoxy-ethyl)-4-carboxymethyl-6-((2S,3R,4S,5R,6R)-3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yloxy)-5,6-dihydro-4H-pyran-3-carboxylic acid methyl ester