Stability condition | Purity (area%) | 2-hydroxy-5-methylpyridine (area%) | Iodobenzene (area%) | Single maximum impurity (area%) | Total impurities (area%) |
Pirfenidone @ 5 N HCl-RT after 24 hours | 99.91 | ND | ND | 0.01 | 0.09 |
Pirfenidone @ 5 N NaOH-RT 24 hours | 99.90 | ND | ND | 0.03 | 0.07 |