Table 5. Results of ImpC assessment

Character	Method	Criteria
Appearance		White crystal, odorless
Solubility		Insoluble in water, sparingly soluble in methanol, freely soluble in ethyl acetate
Melting point	DSC	106.5°C
Loss on drying	TGA (up to 250°C)	0.15%
Identity	IR	ν (cm–1): 2,978.1 (C-H alkane); 1,735.9 (C=O ester); 1,658.8 (C=O conjugated ketone); 1,242.1 (C-O ester)
	MS	HRMS (+): m/z=447.15905 [M+H]+; m/z=469.14521 [M+Na]+; m/z=273.06878 [M-C8H13O4]+
	NMR	NMR data were suitable with Figs. 4 and 5
Purity	HPLC	>99.0% on the basis

DSC, differential scanning calorimetry; TGA, thermogravimetric analysis; IR, infrared; MS, mass spectrometry; NMR, nuclear magnetic resonance; HPLC, high-performance liquid chromatography.