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Robustic acid, derived from the roots of Derris robusta, is a 4-hydroxy-3-phenylcoumarin closely related to scandenin and Ionchocarpic acid. Methyl robustate, a 4-methoxy-3-phenylcoumarin, has also been isolated.
α- and β-Isodihydrorobustic acid have been synthesised by unambiguous methods.
The demethylation of dihydrorobustic acid has been investigated and two rearrangement products have been characterised.
A. P. Johnson and A. Pelter, J. Chem. Soc. C, 1966, 606 DOI: 10.1039/J39660000606
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