Fig. 3From: Smart green spectrophotometric assay of the ternary mixture of drotaverine, caffeine and paracetamol in their pharmaceutical dosage forma: First derivative spectrophotometry for 10 µg/mL DRT, 6 µg/mL CAFF and 15 µg/mL PAR. b: Second derivative spectrophotometry for 10 µg/mL DRT, 6 µg/mL CAFF and 15 µg/mL PARBack to article page