Solifenacin Impurity 1

1-Phenyl-1,2,3,4-tetrahydroisoquinoline is a Solifenacin (S676700) intermediate. 1-Phenyl-1,2,3,4-tetrahydroisoquinoline had been detected in parkinsonian human brain. 1-Phenyl-1,2,3,4-tetrahydroisoquinoline maybe a candidate for endogenous MPTP-like neurotoxin since it is a structural analogue of MPTP which produces parkinsonism in humans.