Birhi, D. N.; Abi, F. D. Y. P.; Laka, A. F.; Primarista, N. P. V. PRELIMINARY PHYTOCHEMICAL ANALYSIS OF THE METHANOL EXTRACT OF RHODODENDRON RENSCHIANUM FLOWERS, ENDEMIC TO KELIMUTU NATIONAL PARK, INDONESIA, USING UV–VIS SPECTROPHOTOMETRY. Walisongo J. Chem. 2026, 9, 112-126.