Deacetylorientalide (compound 19) is a germacrane-type sesquiterpenoid compound that can be found in from Sigesbeckia orientalis.

N-Acetyl-Ser-Asp-Lys-Pro (TFA), an endogenous tetrapeptide secreted by bone marrow, is a specific substrate for the N-terminal site of ACE.

Camellianin A has anticancer activity, it can inhibit the proliferation of the human hepatocellular liver carcinoma Hep G2 and human breast adenocarcinoma MCF-7 cell lines in a dose-dependent manner and induce the significant increase of the G0/G1 cell population.