Development of Colorimetric Method for the Quantitative Analysis of Amlodipine Besylate in Dosage Form Using 4-Dimethyleaminobenzaldehyde as Derivatizing Reagent (Abdul Ghani Memon, Ayaz Ali Memon, Faqeer Mahboob Ali Rind, Zahid Ali Zounr, Azhar Ali Ayaz Pirzada, Nazir Ahmed Brohi, Mazhar Iqbal Khaskheli, & Jamil Rahman Memon , Trans.). (2020). Pakistan Journal of Analytical & Environmental Chemistry, 21(1), 27 – 33. https://doi.org/10.21743/pjaec/2020.06.04