title: A new diterpene from the stems of Trigonostemon heterophyllus.
abstract: OBJECTIVE
  To investigate the chemical constituents in the stems of Trigonostemon heterophyllus.
  
  
  METHODS
  The chemical constituents were isolated by column chromatography on silica gel, Rp-18, and Sephadex LH-20, and their structures were elucidated on the basis of spectroscopic analysis.
  
  
  RESULTS
  Three compounds were isolated and identified as a new diterpene, trigonoheterene B (1), together with two known compounds, trigonostemone (2) and trigonochinene B (3).
  
  
  CONCLUSIONS
  Compound 1 is new. Compounds 2 and 3 showed antibacterial activities.
authors.affiliation: Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; Haikou Experimental Station, Chinese Academy of Tropical Agricultural Sciences, Haikou, 570102, China.
authors.forename: Yi-Xing
authors.initials: YX
authors.lastname: Li
authors.affiliation: Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; Haikou Experimental Station, Chinese Academy of Tropical Agricultural Sciences, Haikou, 570102, China.
authors.forename: Wen-Jian
authors.initials: WJ
authors.lastname: Zuo
authors.affiliation: Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; Haikou Experimental Station, Chinese Academy of Tropical Agricultural Sciences, Haikou, 570102, China.
authors.forename: Wen-Li
authors.initials: WL
authors.lastname: Mei
authors.affiliation: Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; Haikou Experimental Station, Chinese Academy of Tropical Agricultural Sciences, Haikou, 570102, China.
authors.forename: Hui-Qin
authors.initials: HQ
authors.lastname: Chen
authors.affiliation: Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; Haikou Experimental Station, Chinese Academy of Tropical Agricultural Sciences, Haikou, 570102, China. Electronic address: daihaofu@itbb.org.cn.
authors.forename: Hao-Fu
authors.initials: HF
authors.lastname: Dai
mesh_terms: D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification; D004365:Drugs, Chinese Herbal / Q000737:chemistry* / Q000302:isolation & purification; D019665:Euphorbiaceae / Q000737:chemistry*; D015394:Molecular Structure; D018547:Plant Stems / Q000737:chemistry*
chemical_list: D004224:Diterpenes; D004365:Drugs, Chinese Herbal
keywords: Antibacterial activities; Diterpene; Trigonoheterene B; Trigonostemon heterophyllus