Table 9. Robustness of the Method (Different Column Temperatures and Different Columns).

method used	impurity F (%)	impurity B (%)	impurity A (%)	unknown (%)	unknown (%)	total impurities (%)
developed method (Table 5) (Gemini C18, 150 × 4.6 mm, 3 μm)	0.06	0.06	0.36	0.07	0.05	0.60
developed method (Table 5), column Ta = 45 °C (Gemini C18, 150 × 4.6 mm, 3 μm)	0.05	0.06	0.35	0.08	0.07	0.61
developed method (Table 5), column Ta = 55 °C (Gemini C18, 150 × 4.6 mm, 3 μm)	0.07	0.06	0.34	0.07	0.07	0.61
developed method (Table 5), using Venusil AQ C18 (150 × 4.6 mm, 3 μm; instead of Gemini C18)	0.06	0.07	0.34	0.08	0.06	0.61

^aT is the temperature.