Toyooka, N., Zhou, D., Nemoto, H., Garraffo, H. M., Spande, T. F., & Daly, J. W. (2007). Flexible synthetic routes to poison-frog alkaloids of the 5,8-disubstituted indolizidine-class I: Synthesis of common lactam chiral building blocks and application to the synthesis of (-)-203A, (-)-205A, and (-)-219F. Beilstein-Institut.

Toyooka, Naoki, Dejun Zhou, Hideo Nemoto, H Martin Garraffo, Thomas F. Spande, a John W. Daly. Flexible Synthetic Routes to Poison-frog Alkaloids of the 5,8-disubstituted Indolizidine-class I: Synthesis of Common Lactam Chiral Building Blocks and Application to the Synthesis of (-)-203A, (-)-205A, and (-)-219F. Beilstein-Institut, 2007.

Toyooka, Naoki, et al. Flexible Synthetic Routes to Poison-frog Alkaloids of the 5,8-disubstituted Indolizidine-class I: Synthesis of Common Lactam Chiral Building Blocks and Application to the Synthesis of (-)-203A, (-)-205A, and (-)-219F. Beilstein-Institut, 2007.