| abstract |
Compounds represented by the general formula:n n[wherein R 1 represents methoxy, ethyl, methylthio, etc.,nR 2 , R 3 and R 4 each represent hydrogen, a halogen, etc.,nR 5 and R 6 each represent -X 5 -X 6 -X 7 (wherein X 5 representsna single bond or -CO-, X 6 represents a single bond,n-NR 3a , etc. and X 7 and R 3a each represent hydrogen, C 1-10 nalkyl, etc.), and Ar represents phenyl, pyridyl, etc.],nsalts thereof and hydrates of the foregoing. |