2,5-Dihydroxy-4-methoxyacetophenone (compounds 3) can be isolated from the 80% methanol extract of roots of Cynanchum paniculatum Kitagawa. 2,5-Dihydroxy-4-methoxyacetophenone inhibits glutamate-induced cytotoxicity in hippocampal HT22 cell line.

(2E,6Z)-nona-2,6-dien-1-ol (trans,cis-2,6-Nonadien-1-ol) is a Rifm flavor that inhibits the reaction of cysteine ??with glucose.

Coelonin shows moderate cytotoxic activity against HepG2 cells.