| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing neuraminic acid derivatives and to provide neuraminic acid derivatives having high purity.SOLUTION: This invention relates to: a compound having formula (I), which has the content of a compound having formula (VII) of 0.5 wt.% or lower, wherein in the formula (VII), Rrepresents a 1-19C alkyl group, Rrepresents a 1-4C alkyl group, and Ac represents an acetyl group, provided that the compound having the formula (I) may contains a compound having formula (II); or a pharmacologically acceptable salt thereof. |
