title: Bioactive diterpenes from Orthosiphon labiatus and Salvia africana-lutea.
abstract: The known (+)-trans-ozic acid (1) and two new labdane diterpenoids (2 and 3) have been isolated from an ethanol extract of Orthosiphon labiatus. The structures of 2 and 3 were established mainly by 1D and 2D NMR spectroscopic means. The ethanolic extract of Salvia africana-lutea afforded the known abietane diterpenoids carnosol (4), rosmadial (5), and carnosic acid (characterized as its derivative 6). Compounds 3 and 6 exhibited MICs of 157 and 28 microM, respectively, against Mycobacterium tuberculosis, while 2 and 6 showed cytotoxic activity with IC50 82 and 69 microM, respectively, against a breast (MCF-7) human cancer cell line.
authors.affiliation: Department of Chemistry of Medicinal Plants, National Research Center, El-Tahrir Street, Dokki, Cairo, Egypt.
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Hussein
authors.forename: Jacobus J M
authors.initials: JJ
authors.lastname: Meyer
authors.forename: María L
authors.initials: ML
authors.lastname: Jimeno
authors.forename: Benjamín
authors.initials: B
authors.lastname: Rodríguez
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D000995:Antitubercular Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D005260:Female; D006801:Humans; D020128:Inhibitory Concentration 50; D015394:Molecular Structure; D009169:Mycobacterium tuberculosis / Q000187:drug effects; D031342:Orthosiphon / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D027544:Salvia / Q000737:chemistry*
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D000995:Antitubercular Agents; D004224:Diterpenes; C433017:labdane