Delphinidin 3-rutinoside chloride (Delphinidin 3-O-rutinoside chloride) is an anthocyanin component. Delphinidin 3-rutinoside chloride is isolable from the fruits of blackcurrant Ribes nigrum L. Delphinidin 3-rutinoside chloride activates the ETB receptor and stimulates the NO/cGMP pathway. Delphinidin 3-rutinoside chloride increases cyclic guanosine monophosphate production and reduces the phosphorylation level of Myosin regulatory light chain. Delphinidin 3-rutinoside chloride stimulates GLP-1 secretion. It significantly induces relaxation of bovine ciliary muscle strips contracted by ET-1 and inhibits ET-1-induced contraction of bovine ciliary muscle strips. Delphinidin 3-rutinoside chloride is applicable to research related to type 2 diabetes[1][2].