| http://www.w3.org/ns/prov#value | - Patents such as U.S. Pat. No. 7,166,730B2, U.S. Pat. No. 7,157,590B2 and WO2005058812 have detailedly reported a synthesis method of the compound, but research on crystalline forms of the compound has been little reported, and only US2009/016359A1 disclosed a crystalline form (referred to as a crystalline form B, see FIG. 1), the characteristic peaks where diffraction angles 2?? are 5.4, 6.2, 10.9
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