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World Health Organization (WHO). Tuberculosis Fact sheet No. 104-Global and Regional Incidence, March 2006.
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Emergence of Mycobacterium tuberculosis with extensive resistance to second-line drugs-worldwide, 2000-2004. MMWR Morb. Mortal Wkly. Rep. 2006, 55, 301.
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Emergence of Mycobacterium tuberculosis with extensive resistance to second-line drugs-worldwide, 2000-2004. MMWR Morb. Mortal Wkly. Rep. 2006, 55, 301.
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6
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Steroids are important natural products that possess diverse biological activity, including cytotoxic and antimycobacterial activities. For recent articles related to the antitubercular properties of naturally occurring steroids, see:
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Steroids are important natural products that possess diverse biological activity, including cytotoxic and antimycobacterial activities. For recent articles related to the antitubercular properties of naturally occurring steroids, see:. Cantrell C.L., Rajab M.S., Franzblau S.G., Fronczek F.R., and Fischer N.H. Planta Med. 65 (1999) 732
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9
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14
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53649087017
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note
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The starting sterols 24-methylene-cholesterol (1) and 24-α-ethyl-cholesterol (4) were extracted, respectively, from the Caribbean marine sponges S. zeai and Myrmekioderma styx. Commercial cholesterol (6) was purchased from Aldrich Chemical Company. Gorgosterol (8) and 24-α-methyl-cholesterol (10) were extracted from the Caribbean gorgonian octocoral Gorgonia mariae. Abeo-sterol 3 was prepared from precursor 1 as described.
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15
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53649109028
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note
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4), and concentrated in vacuo. Purification by silica gel flash column chromatography (hexane/EtOAc 90:10 or hexane/acetone 90:10) afforded the desired 5(6 → 7)abeo-sterol derivatives (15.5-26.0 mg; 30-50% isolated yield) as colorless oils with 97-98% purity.
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17
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0035801850
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Van Soest, R.W.M.5
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18
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53649100766
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note
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2)
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20
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0030445833
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Cantrell C.L., Lu T., Fronczek F.R., Fischer N.H., Adams L.B., and Franzblau S.G. J. Nat. Prod. 59 (1996) 1131
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Cantrell, C.L.1
Lu, T.2
Fronczek, F.R.3
Fischer, N.H.4
Adams, L.B.5
Franzblau, S.G.6
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22
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33846904705
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Van der Geize R., Yam K., Heuser T., Wilbrink M.H., Hara H., Anderton M.C., Sim E., Dijkhuizen L., Davies J.E., Mohn W.W., and Eltis L.D. Proc. Natl. Acad. Sci. U.S.A. 104 (2007) 1947
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Van der Geize, R.1
Yam, K.2
Heuser, T.3
Wilbrink, M.H.4
Hara, H.5
Anderton, M.C.6
Sim, E.7
Dijkhuizen, L.8
Davies, J.E.9
Mohn, W.W.10
Eltis, L.D.11
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