| abstract |
The present invention provides a novel compound having ansuperior acetylcholinesterase inhibitory action. It providesna compound represented by the formula:n n(In the formula, R 1 represents a group represented by thenformula:n n(wherein, R 3 , R 4 , R 5 and R 6 are the same as or different fromneach other and each represents a hydrogen atom, an optionallynsubstituted C 1-6 alkoxy group and the like; and m represents anninteger from 0 to 6) and the like; and R 2 represents a hydrogennatom, an optionally substituted C 1-6 alkyl group, an optionallynsubstituted C 2-6 alkenyl group or an optionally substituted C 2-6 nalkynyl group), a salt thereof or a hydrate of them. |