NMR Spectroscopy of Naturally Occurring Phloroglucinol Derivatives
Part III: Carbon-13 Spectral Analysis and Tautomeric Structures of Eight Filicinic Acids, 2-Butyryl-4-Hydroxy-4,6-Dimethyl-1,3,5-Cyclohexantrione and 6-Methyl-2,3-Dihydropyrane-2,4-Dione
P. Äyräs, S. Lötjönen, C. J. Widén
Planta Med 1981; 42(6): 187-194
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http://dx.doi.org/10.1055/s-2007-971624