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Buddlejol, a new α-chymotrypsin inhibitor from Buddleja asiatica

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Abstract

Buddlejol (1), a new sterol, has been isolated from the ethyl acetate soluble fraction of the antispasmodic plant Buddleja asiatica along with stigmasterol (2), lignoceric acid (3), taraxerol (4) and α-amyrin (5), respectively. The structure of Buddlejol (1) was established as (24S)-stigmast-5,22-diene--ethoxy--ol by spectral analysis and comparison with closely related structures. Buddlejol revealed to be a competitive inhibitor of chymotrypsin with the Ki value of 10.60 µM as indicated by Lineweaver–Burk and Dixon plots and their re-plots against its chymotrypsin inhibition assay, while the other compounds showed less inhibitory potential. The bioassay-guided isolation was stimulated by the preliminary cytotoxic screening of various fractions of B. asiatica.

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Correspondence to Farman Ali Khan.

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Khan, F.A., Khan, N.M., Khan, H.U. et al. Buddlejol, a new α-chymotrypsin inhibitor from Buddleja asiatica . Med Chem Res 24, 980–986 (2015). https://doi.org/10.1007/s00044-014-1192-9

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