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Determination of Total Phenolic Levels of Raru Wood Extract (Cotylelobium Lanceolatum Craib) Based on Differences in Ethanol Concentration by Uv-Vis Spectrophotometry Method. JPS 2023, 6 (4), 1811-1818. https://doi.org/10.36490/journal-jps.com.v6i4.306.