“…The chemical shifts at d C 175.9 (s, C-18) indicated that 3 was a diterpenoid saponin with ester bond. Comparison of the NMR data of 3 with the known compound 13b-hydroxylabda-8(17), 14-dien-18-oic acid (Du et al, 2001;Hieda et al, 1983Hieda et al, , 1982bWang et al, 2012) indicated that there was a trisaccharide moiety in 3. The deduction was confirmed by the HMBC correlations between anomeric proton at d H 5.46 (1H, s, H-1 0 ) of Rha-1 unit to carboxyl carbon at d C 175.9 (s, C-18) of aglycone unit; between anomeric proton at d H 6.25 (1H, d, J = 8.1 Hz, H-1 00 ) of Glc unit and carbon at d C 73.6 (d, C-4 0 ) of Rha-1 unit; between anomeric proton at d H 6.47 (1H, s, H-1 000 ) of Rha-2 unit and carbon at d C 76.4 (d, C-2 00 ) of Glc unit were observed.…”