| abstract |
Disclosed is a compound which has an excellent gastric acid secretion inhibitory activity that lasts for a more prolonged period and which can maintain the intragastric pH value at a high level for a longer period, and therefore is useful as a therapeutic or prophylactic agent for a disease or condition caused by gastric acid. Also disclosed is a compound which is an active form (a form converted in vivo after administration) of the above-mentioned compound and which is represented by the general formula (1a) [wherein R2 represents a group represented by the formula (I): or the like; and R1, R3, W1 and X- are as defined in the description. |