N-acetylcarnosine (NAC) is thought to be able to combat some of the effects of oxidative stress as it has anti-oxidant properties.Right eyes of the rabbits (male grey chinchilla rabbits aged 3-4 months weighing 2-3 k) are instilled with 80 μL of formulation A containing 1 % N-Acetylcarnosine.

(+)-Cuparene is a bioactive chemical.

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 .