Cistanoside C (Jionoside D) is a hydroxycinnamic acid esters of phenethylalcohol glycoside, that can be isolated from roots of Rehmannia glutinosa var. purpurea[1].
References
[1] Sasaki H, et al. Hydroxycinnamic acid esters of phenethylalcohol glycosides from Rehmannia glutinosa var. Purpurea[J]. Phytochemistry, 1989, 28(3):875-879.
