| 1-(4-(dimethylamino)-2-butynyl)-5-methyl-2-pyrrolidinon (S)-2-pyrrolidinon ethanedioate |
| (S)-1-(4-(dimethylamino)-2-butynyl)-5-methyl-2-pyrrolidinone ethanedioate (2: |
| (S)-n-(4-(dimethylamino)-2-butynyl)-5-methyl-2-pyrrolidone sesquioxalate |
| 1-(4-(dimethylamino)-2-butynyl)-5-methyl-2-pyrrolidinon (S)-2-pyrrolidinon ethanedioate (2:3) |
