The present invention relates to a compound represented by formula (I) or its pharmaceutically acceptable salts, esters or stereoisomers, wherein R1 in formula (I)is C1-C6 aldehyde group C1-C6 carboxyl group C6-C10 aryl amino group C1-C6 alkyl group, wherein the aryl group, depending on situation, is substituted by one or more hydroxyl groups, C1-C6 alkyl group, or C1-C6 alkoxy group or C1-C6 alkyl carbonyl vinyl or C1-C6 alkoxy carbonyl vinyl R2 in formula (I) is glucopyranose group or H the symbol (a solid line and an underneath parallel dotted line) in formula (I) represents a single bond or a double bond.本發明係關於一種式(I)化合物或其醫藥上可接受之鹽類、酯類或立體異構物: 式(I) 其中,R1為C1-C6醛基;C1-C6羧基;C6-C10芳基胺基C1-C6烷基,其中該芳基視情況經一或多個羥基、C1-C6烷基或C1-C6烷氧基取代;或C1-C6烷基羰基乙烯基或C1-C6烷氧基羰基乙烯基;R2為葡萄哌喃糖基或H; 為單鍵或雙鍵。
