Tetrahydroxy-1,4-benzoquinone, also called tetrahydroxy-p-benzoquinone, tetrahydroxybenzoquinone, or tetrahydroxyquinone (THBQ, THQ), is an organic compound with formula C6O2(OH)4.

Corydaline, an isoquinoline alkaloid, is one of the major active constituents in a new prokinetic botanical agent.

Ranatensin is a undecapeptide and a Bombesin Receptor angonist, can be isolated from amphibian skin, such as the frog, Rana pipiens. Ranatensin could maintain the dynamic balance of animal blood pressure, without cross-tachyphylaxis with Angiotensin amide, Bradykinin , or Norepinephrine .