The invention belongs to the field of medical technology, and particularly relates to a
glucoside derivate shown as a formula (I), and a medically acceptable salt, an ester easily hydrolyzed, a stereoisomer and an itnemrediate of the
glucoside derivate, and a preparation method of the compounds and the intermediate, in particular to a
glucoside derivate which is served as a
sodium-glucose co-
transporter (SGLT) inhibitor, a medically acceptable salt, an ester easily hydrolyzed, a stereoisomer and an itnemrediate of the glucoside derivate, and a preparation method of the compounds and the intermediate. The glucoside derivate provided by the invention can be used for treating
diabetes mellitus such as
insulin dependent
diabetes mellitus (I
type diabetes mellitus) and non-
insulin dependent
diabetes mellitus (II
type diabetes mellitus), and also can be applied to treating
insulin resistance diseases and various diseases relevant to diabetes mellitus of fat, and preventing such diseases, wherein R1, R2, R3, R4, R5, R6, R7, R7a, R7b, R7c, X, n and A are defined as shown in the specification.