Comprehensive NMR Spectral Analysis and Prediction of Selected Coumarin Derivatives Using 1H, 13C, 2D-COSY, HSQC, and HMBC Techniques. A-JMRHS [Internet]. 2025 Aug. 11 [cited 2026 Mar. 27];3(02):34-42. Available from: https://ajmrhs.com/journal/article/view/99