| abstract |
The present invention has an excellent gastric acid secretion inhibitory action useful as a therapeutic or preventive agent for diseases or symptoms caused by gastric acid, has a longer gastric acid secretion inhibitory action, and can maintain a high gastric pH for a long time And a compound represented by the general formula (1a) which is an active substance (converted body in the body after administration) of the compound (wherein R 2 is And R 1 , R 3 , W 1 and X − are the same as defined in the specification). |