5-acetamido-3,5,7,9-tetradeoxy-7-formamido-L-glycero-L-manno-nonulosonic acid 、 alkaline earth salt of/the/ methylsulfuric acid 在
sodium tetrahydroborate 作用下,
生成 (4S,5S,6S,7S,8S)-5-(Acetyl-methyl-amino)-7-formylamino-2,4,6,8-tetramethoxy-nonanoic acid methyl ester