Table 1. The basic information of the five principal components.

Peak no.	Retention time (min)	Chemical structure	Chemical name
1	6.654	R1 = Tig, R2 = Ac	Tenacissoside G [18]
2	7.475	R1 = Bz, R2 = Ac	Tenacissoside I [18]
3	12.258	R1 = Bu, R2 = Tig	Marsdenoside A [19]
4	14.455	R1 = Tig, R2 = Tig	Marsdenoside B [19]
5	15.937	R1 = Bu, R2 = Bz	Marsdenoside C [19]

Five compounds 1∼5 were isolated from FR5 by preparative high performance liquid chromatography (HPLC) and identified by nuclear magnetic resonance (NMR) analyses and compared with the literatures.