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Solifenacin Impurity C Solifenacin Impurity 6 Solifenacin EP Impurity C Solifenacin EP Impurity B Solifenacin Impurity 9（Solifenacin EP Impurity C） bis((S)-1-phenyl-3,4-dihydroisoquinolin-2(1H)-yl)methanone Bis[(1S)-1-phenyl-3,4-dihydroisoquinolin-2(1H)-yl]methanone Bis[(1S)-3,4-dihydro-1-phenyl-2(1H)-isoquinolinyl]-methanone Methanone, bis[(1S)-3,4-dihydro-1-phenyl-2(1H)-isoquinolinyl]- Solifenacin EP Impurity C (Solifenacin (S,S)-Methanone Impurity) ((S)-1-phenyl-3,4-dihydroisoquinolin-2(1H)-yl)(1-phenyl-3,4-dihydroisoquinolin-2(1H)-yl)methanone Solifenacin impurity 3/Solifenacin EP Impurity C/Solifenacin (S,S) Methanone Impurity/Bis[(1S)-3,4-dihydro-1-phenyl-2(1H)-isoquinolinyl]-methanone