Calcium salt of (1S, 2R) - 3 - [[(4-aminophenyl) sulfonyl] (isobutyl) amino] -1-benzyl-2 - (phosphonooxy) propylcarbamate of (3S) -tetrahydro-3-furanyl, Form I , which has substantially the same pattern of X-ray diffraction through dust as shown in Figure 1, wherein said powder diffraction model is obtained with a diffractometer using K alpha copper X radiation.
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