The bark of Guarea species has been found to be a rich source of limonoids. One has been identified as methyl 6,12α-diacetoxyangolensate (1; R = OAc); the 12-acetyl group in this is strongly shielded by the furan ring.
J. D. Connolly, D. A. Okorie and D. A. H. Taylor, J. Chem. Soc., Perkin Trans. 1, 1972, 1145 DOI: 10.1039/P19720001145
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