| abstract |
(57) A therapeutic agent for brain diseases such as senile dementia, Alzheimer's disease or Huntington's chorea, a pressure-boosting agent, an immunopotentiator for activating immunocompetent cells, a rosacea, a skin ulcer An object of the present invention is to provide a compound useful as a therapeutic agent or as a therapeutic agent for type I diabetes by promoting insulin secretion. The compound of the present invention is a compound represented by the following structural formula (1) or a pharmacologically acceptable salt thereof. In the above formula (1), R 1 , R 2 , R 3 , R 4 , R 5 and R 6 each independently represent a hydrogen atom or a phosphoric acid residue (-P (= O) (OH) 2 ) is shown, and R 7 is a hydrogen atom, having 1 to 4 carbon atoms Or an alkoxy group or a group represented by the following formula, wherein X is a halogen atom: However, when R 7 is an adenyl group, a compound in which R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are all hydrogen atoms, and R 1 , R 4 and R 5 are phosphoric acid residues And the other compounds are hydrogen atoms, R 4 and R Excludes compounds in which 5 is a phosphoric acid residue and the others are hydrogen atoms. [Chemical formula 1] |