| abstract |
Provided are compounds excellent in acid secretion inhibitory activity, antiulcer activity and the like. Compound represented by the following formula or its salt: [Wherein, R 1 is a substituent, R 2 is a cyano group, C 1 -6 alkyl group, or (iii) with a hydrogen atom, (ii) halogen atom, (i) optionally, R 3 is (i) hydrogen atom, ( ii) halogen atom, (iii) a cyano group, C 1 -6 alkyl group, or (v) a C 1 -6 alkoxy group optionally having a halogen atom, R 2 and R 3 has one of the (iv) a halogen atom and optionally hydrogen An atom and the other is a substituent other than a hydrogen atom. |