QUANTIFICATION AND IN-HOUSE REFERENCE STANDARD PREPARATION OF TANSHINONE IIA FROM DANSHEN (Salvia Miltiorrhiza Bunge) ROOTS COLLECTED IN LAI CHAU, GIA LAI, AND LAM DONG PROVINCES. Vietnam Journal of Agriculture and Environment 2026, No. 2, 40-49. https://doi.org/10.71254/sx3r3v93.