Compound 3 was recognized as a phloroglucinol substituted A-type dimer, and its molecular formula was determined as C36H28O15 by the (+)-HRESIMS peak at 701.1504 [M + H] + and the 13 C NMR data (Table ). The ECD spectrum of 3 exhibited a high-amplitude positive CE in the region 220-240 nm (Figure ), which assigned the double linkages (2→O→7,4→8) and the 4phloroglucinol moiety as being -oriented. Comparison of the ECD spectra of 3 with those of 4 and 6 revealed that compound 3 exhibited a negative CE in the region 280-290 nm analogous to that of 4 (Figure ). The absolute configuration of (2R, 3R) in unit II of 3 was thus determined. Considering the diagnostic power of the -gauche effect, the upfield shifted C-2 (C79.1, ring F) compared to the corresponding carbon in 4 (C 81.5) suggested H-2 and H-4 to be transpositioned. This further corroborated the absolute configuration in unit II as being 2R, 3R.