Physical crystal structures of a compound of the formula (I): are provided including the free base monohydrate thereof (form H-1) and the hydrochloric acid salt thereof including hydrochloric acid salt containing 0.75 equivalent of H2O (form H0.75-3) and hydrochloric acid salt containing 2 equivalents of H2O (form H2-1) and hydrochloric acid salt Pattern P-5 preferably in substantially pure form and other forms as described herein pharmaceutical compositions containing structures of compound I or IA processes for preparing same intermediates used in preparing same and methods of treating diseases such as diabetes using such structures.

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