摘要:
The present invention relates to sialic acid derivatives. According to the present invention, there is provided sialic acid derivatives having the general formula (I):
wherein, R¹ represents hydrogen, an acetyl group, or a trityl group, R² represents hydrogen or an acetyl group, one of R³ and R⁴ represents chlorine, -OAc, -OH,
, or
(R⁷ represents a hydrogen atom or an acetyl group, R⁸ represents a hydrogen atom, an acetyl group or a benzyl group, R⁹ represents a hydrogen atom, an acetyl group, a benzyl group or
or
wherein R¹⁰ represents a hydrogen atom or a benzoyl group), while the other represents -COOR¹¹ wherein R¹¹ represents hydrogen, sodium, or a methyl group.
摘要:
An expectorant capable of acting on the rheological properties of sputum and capable of directly promoting the ciliary motion. The expectorant contains N-acetylneuraminic acid
摘要:
The present invention relates to sulfated oligosaccharides or their derivatives such as the following compound and being useful for diagnosing or treating diseases such as immunity-related diseases and mucopolysaccharide dieseases.
摘要:
Sodium N-acetylneuraminate trihydrate herein provided is represented by the following formula: The sodium N-acetylneuraminate trihydrate can be prepared, for instance, according to a method which comprises the steps of: dissolving sodium N-acetylneuraminate in water or in a mixture of water and an organic solvent; allowing the resulting solution to stand; precipitating and separating the resulting crystals of sodium N-acetylneuraminate · trihydrate; and then drying the separated crystals. The sodium N-acetylneuraminate trihydrate has very low hygroscopicity and hence can be handled without any difficulty in the form of powder.