title: [The isolation and identification of four new 2, 2-dimethylchromenes].
abstract: Four new 2, 2-dimethylchromenes named leptol B (I), ethylleptol B (II), methylleptol B (III), leptene B (IV), along with a known chromene-methylevodionol (V) have been isolated from the aerial parts of Evodia lepta. Their structures were elucidated by spectroscopic analysis and chemical techniques.
authors.affiliation: State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 200031.
authors.forename: G L
authors.initials: GL
authors.lastname: Li
authors.forename: J F
authors.initials: JF
authors.lastname: Zeng
authors.forename: D Y
authors.initials: DY
authors.lastname: Zhu
mesh_terms: D001578:Benzopyrans / Q000737:chemistry / Q000302:isolation & purification*; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D019684:Magnoliopsida / Q000737:chemistry; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D001578:Benzopyrans; D004365:Drugs, Chinese Herbal; C442151:ethylleptol B; C442150:leptol B