| abstract |
The compounds represented by general formula 1, wherein R 1 and R 2nthey are typically hydrogen atoms, R 3 and R 4 are typically hydrogen atomsnor a lower alkyl group, R 5 is typically a hydrogen atom, X bnX 2, X 3 and X 4 are typically hydrogen or lowernalkoxy, A is typically optionally substitutednthe pyridine ring, man are each 0 and 1 having NOSninhibitory agents are useful as therapeuticsncerebrovascular diseases, and other pharmaceutical preparations. |