The present invention is dibutyrul adenosine cyclophosphate calcium and its hydrate in the molecular formula of C18H23N5O8P.1/2Ca.nH2O, where n=0-2 5 of different characters. Dibutyrul adenosine cyclophosphate calcium is slightly soluble in water at room temperature and insoluble in ethanol and has high storage stability. Dibutyrul adenosine cyclophosphate calcium and its hydrate are used as protein kinase activator for treating cardiac and cerebral vascular diseases mainly as well as in regulating growth of mammals. |