Analyzing the H NMR spectra (Figure ) of the phloroglucinolysis product of 17 revealed that its products were the same, but present in different molar ratios compared to those of 16. The products of 17 consisted of 3 as major and 9 as minor in terms of their molar ratio, while 9 was found as major and 3 as minor phloroglucinolysis products of 16. Compounds 3 and 9 were, thus, assigned as C-2 epimerization products during phloroglucinolysis. Accordingly, 9, was recognized as a C-2 epimer of 3 and elucidated as [PAC 5]-(4→2)-phloroglucinol.