title: Two new labdane diterpenoids from the rhizomes of Isodon yuennanensis.
abstract: Two new labdane diterpenoids, s-trans-8(17),12E,14-labdatrien-20-oic acid (1), s-trans-12E,14-labdadien-20,8β-olide (2), along with 10 known compounds, hinokiol (3), ursonic acid (4), 2α,3α-dihydroxyolean-12-en-28-oic acid (5), 2α,3β,23-trihydroxyolean-12-en-28-oic acid (6), ethyl 3-(3,4-dihydroxyphenyl)lactate (7), ethyl rosmarinate (8), (Z,E)-2-(3,4-dihydroxyphenyl)ethenyl caffeic ester (9), tridecanoic acid (10), β-sitosterol (11) and daucosterol (12), were isolated from the 70% acetone extract of the rhizomes of Isodon yuennanensis. Their structures were elucidated based on the analyses of extensive spectroscopic data and physicochemical properties.
authors.affiliation: a College of Pharmacy and Chemistry, Institute of Materia Medica, Dali University , Dali 671000 , P.R. China.
authors.forename: Zhen-Yuan
authors.initials: ZY
authors.lastname: Huang
authors.forename: Bo
authors.initials: B
authors.lastname: Huang
authors.forename: Chao-Jiang
authors.initials: CJ
authors.lastname: Xiao
authors.forename: Xiang
authors.initials: X
authors.lastname: Dong
authors.forename: Bei
authors.initials: B
authors.lastname: Jiang
mesh_terms: D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification; D037602:Isodon / Q000737:chemistry*; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry; D027343:Rhizome / Q000737:chemistry*
chemical_list: D004224:Diterpenes; D010936:Plant Extracts; C433017:labdane
keywords: Isodon yuennanensis; chemical constituents; labdane diterpenoids