The present invention provides a novel form of 3-(3-{4-[3-(.beta.-D-gluco-pyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}propylamino)-2,2-dimethylpropionamide with improved storage stability. Since bis[3-(3-{4-[3-(.beta.-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}propyl-amino)-2,2-dimethylpropionamide] monosebacate has extremely excellent storagestability, it is useful as a drug substance. Furthermore, it shows anextremely goodcrystalline property and can be purified by a convenient method, and thereforeissuitable for the industrial preparation.
