| abstract |
(57) [Summary] (Modified) [Structure] A salt of 3,3-dimethyl-6-ethoxyindori suitable for use in a pharmaceutical composition, which can be produced in a large amount by a chemical production method, is provided. [Structure] 3,3-Dimethyl-6-ethoxyindoline hydrochloride, in particular, 3,3-dimethyl-6-ethoxyindoline hydrochloride anhydrous, which is a crystal modification A having a specific diffraction pattern and stable at room temperature, Production method and 3,3-dimethyl- A pharmaceutical composition comprising 6-ethoxyindoline hydrochloride. [Effect] 3,3-Dimethyl-6-ethoxyindoline has an analgesic effect. |