| 1-(1-methyl-4-(1-pyrrolidinyl)-2-butynyl)-2-pyrrolidinon (S)-2-pyrrolidinon ethanedioate |
| (S)-1-(1-methyl-4-(1-pyrrolidinyl)-2-butynyl)-2-pyrrolidinone ethanedioate (1 |
| (S)-n-(4-pyrrolidino-2-butynyl)-5-methyl-2-pyrrolidone oxalate |
| 1-(1-methyl-4-(1-pyrrolidinyl)-2-butynyl)-2-pyrrolidinon (S)-2-pyrrolidinon ethanedioate (1:1) |
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