Figure 2From: Utility of certain nucleophilic aromatic substitution reactions for the assay of pregabalin in capsulesAbsorption spectra of (a) NQS 0.5%(w/v) in water (method I). (b) PG (25 μg mL-1) with NQS (method I). (c) DNFB 0.3%(w/v) in methanol (method II). (d) PG (6 μg mL-1) with DNFB (method II).Back to article page