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↑ Sondheimer, F (1960). "Constituents of Casimiroa edulis Llave et Lex.—VI 2′,5,6-Trimethoxyflavone, 2′,5,6,7-tetramethoxyflavone (zapotin) and 5-hydroxy-2′,6,7-trimethoxyflavone (zapotinin)". Tetrahedron. 9 (3–4): 139. doi:10.1016/0040-4020(60)80001-4.
