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.

Hispidin is a natural product, protein kinase C inhibitor, which belongs to the group of 2-pyrones and catechols.

1H-Indole-3-ethanamine, 5-bromo-N,N-dimethyl-, hydrochloride is a marine derived natural products found in Smenospongia echina.