Des-Leu10-angiotensin I is a nonapeptide that inhibits rabbit lung angiotensin-converting enzyme peptidyl-dipeptide hydrolase with a Ki value of 31 μM, which is generated from angiotensin I by the action of carboxypeptidase-like activities residing in the human platelet and mast cell.

Oblongine chloride may have potential haemodynamic effects, it can cause a dose-dependent reduction of systolic and diastolic blood pressure, and that these effects are not mediated by α2-adrenergic receptor stimulation.

3-Hydroxymollugin are cytotoxic compounds isolated from Pentas longiflora and Rubia cordifolia.