Levdansky, V.A., Garyntseva, N.V. and Levdanskiy, A.V. 2023. ESTERIFICATION OF BETULIN 3-ACETATE IN MELTS OF THE MALEIC AND LEVULINIC ACIDS. Chemistry of plant raw material. 4 (Dec. 2023), 361-365. DOI:https://doi.org/10.14258/jcprm.20230412656.