Determination of total phenolic levels of raru wood extract (Cotylelobium lanceolatum Craib) based on differences in ethanol concentration by uv-vis spectrophotometry method. JPS [Internet]. 2023 Nov. 22 [cited 2026 Oct. 22];6(4):1811-8. Available from: https://journal-jps.com/new/index.php/jps/article/view/306