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Several sterols were isolated from Calotropis procera. Analysis of their spectral data (UV, IR, MS, 1H, 13C NMR experiments) confirmed their structures as urs-19(29)-en-3-yl acetate, β-sitosterol and stigmasterol, multiflorenol, urs-19(29)-en-3-β-ol and 3β,27-dihydroxy-urs-18-en-13,28-olide.
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Chundattu et al. (2011) studied this question.
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