title: Lignan derivatives from the stem bark of Syzygium cumini (L.) Skeels.
abstract: Phytochemical investigation of the stem bark of Syzygium cumini (L.) Skeels (Myrtaceae) yielded four new lignan derivatives characterised as (7alpha,8alpha,2'alpha)-3,4,5-trimethoxy-7,3',1',9'-diepoxylignan (cuminiresinol), (7alpha,7'alpha,8alpha,8'alpha)-3,4-dioxymethylene-3',4'-dimethoxy-7,9',7',9-diepoxylignan-5'-ol (5'-hydroxy-methyl-piperitol), (7alpha,7'alpha,8alpha,8'alpha)-3'-methoxy-9-oxo-7,9',7',9-diepoxylignan-3,4,4'-triol or 3-demethyl-9-oxo-pinoresinol (syzygiresinol A), (7alpha,7'alpha,8alpha,8'alpha)-9-oxo-7,9',7',9-diepoxylignan-3,4,3',4',5'-pentaol or 3,3'-didemethyl-9-oxo-pinoresinol (syzygiresinol B) along with the known lignans di-demethyl-5-hydroxypinoresinol, dimethylpinoresinol, didemethoxypinoresinol, pinoresinol and 4'-methyl-5'-hydroxypinoresinol. The structures of these lignans were elucidated on the basis of structural data analysis and chemical reactions.
authors.affiliation: Faculty of Pharmacy, Phytochemistry Research Laboratory, Department of Pharmacognosy and Phytochemistry, Hamdard University, New Delhi, India.
authors.forename: Qurat Y
authors.initials: QY
authors.lastname: Mir
authors.forename: M
authors.initials: M
authors.lastname: Ali
authors.forename: Prawez
authors.initials: P
authors.lastname: Alam
mesh_terms: D017705:Lignans / Q000737:chemistry*; D015394:Molecular Structure; D024301:Plant Bark / Q000737:chemistry*; D018547:Plant Stems / Q000737:chemistry*; D027842:Syzygium / Q000737:chemistry*
chemical_list: D017705:Lignans