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.

Melanin Concentrating Hormone (MCH), a 19 amino acid cyclic peptide, is largely expressed in the hypothalamus. Melanin Concentrating Hormone is implicated in the control of general arousal and goal-orientated behaviours in mammals, and appears to be a key messenger in the regulation of food intake.

3,4,5-Trimethoxy-trans-cinnamic acid is a natural product from the roots and rhizomes of Notopterygium incisum.