solvate of crystal structure (s) of formula Ia propylene glycol

crystalline solvates and complexes of derivatives of (1S) -1,5-anhydro-1-C- (3 - ((phenyl) methyl) phenyl) -D-glucitol with amino acids such as SGLT2 inhibitors for treating diabetes. The present invention relates to physical crystal structures of a compound of formula 1: wherein R1, R ^ 2 ^, r ^ 2a, R3 and R4 are as defined herein, especially pharmaceutical compositions I or II containing compound of structures, processes for preparing them, intermediates used in the preparation thereof, and methods of treating diseases such as diabetes using such a structure.