Salt of pyranose-substituted heterocyclic compound, preparation method therefor and use thereof

An acid addition salt of a compound represented by formula (I) or a prodrug thereof:

• wherein R1, R2 and R6 are the same or different from each other, and independently selected from C1-C8 alkyl which is unsubstituted or optionally substituted with one or more Ra;
• R3 and R5 are the same or different from each other, and independently selected from —(CH2)n— which is unsubstituted or optionally substituted with one or more Rb;
• R4 is selected from C6-C20 aryl which is unsubstituted or optionally substituted with one or more Rc;
• Ra, Rb and Rc are the same or different from each other, and independently selected from the group consisting of halogen, hydroxyl, mercapto, nitro and amino;
• n is an integer of 1 to 8;
• the acid addition salt is selected from the group consisting of maleate, hydrochloride, sulfate, phosphate, citrate, fumarate, gentisate, tartrate and D-glucuronate;
• and
• the prodrug is an ester formed by a hydroxyl group of the compound represented by formula (I) with a first acid.