Figure 2: (a) Phase-I Leflunomide (2.9 min) chromatogram with flurbiprofen (3.37 min) and ibuprofen (3.8 min) and (b) Phase-II. Leflunomide (2.9 min) chromatogram with diclofenac sodium (3.6 min) and mefenamic acid (4.9 min).