| abstract |
A cyanoiminoquinoxaline derivative of the formula (II) is useful as a preventive or therapeutic agent for diseases due to hyperexcitation of glutamate receptors.(wherein, X and Y each is independently O or NCN, provided that at least one of X and Y is NCN; R1, R2, R3, and R4 each is independently hydrogen, halogen, nitro, optionally substituted heterocyclic group etc.; R5 is hydrogen etc.; R1 and R2, R2 and R3, R3 and R4, and R4 and R5, each taken together with the adjacent atoms may form a carbocycle which may be substituted or may contain a heteroatom(s).) |