Bioactive diterpenes from Orthosiphon labiatus and Salvia africana-lutea |
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| Authors: | Hussein Ahmed A Meyer Jacobus J M Jimeno María L Rodríguez Benjamín |
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| Affiliation: | Department of Chemistry of Medicinal Plants, National Research Center, El-Tahrir Street, Dokki, Cairo, Egypt. |
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| 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. |
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