(1)
Yar, M.; Arshad, M.; Akhtar, M. N.; Shahzad, S. A.; Khan, I. U.; Khan, Z. A.; Ullah, N.; Ninomiya, I. Studies towards the Synthesis of (±)-Reserpine: Photocyclization Mediated a Novel and Efficient Synthesis of 11,18-Dimethoxy-(20α)-18,19-Didehydro-Yohimban-17-One. Eur. J. Chem. 2012, 3, 26-31.