Srisombat, N. , Bapia, S. , Ratanabunyong, S. , Choowongkomon, K. , Vajrodaya, S. and Duangsrisai, S. 2019. Isolation of betulinic acid and antioxidant and anti-HIV-1 reverse transcriptase activity of Cratoxylum formosum subsp. pruniflorum (Kurz) Gogelein extract. Agriculture and Natural Resources. 53, 6 (Dec. 2019), 674–680.