Glaxo Laboratories Limited
Patent: US4074047 A1, 1978 ;

Youssef, Amal Mamdouh; Safo, Martin K.; Danso-Danquah, Richmond; Joshi, Gajanan S.; Kister, Jean; Marden, Michael C.; Abraham, Donald J.
Journal of Medicinal Chemistry, 2002 , vol. 45, # 6 p. 1184 - 1195

Johansson, Lars; Fotsch, Christopher; Bartberger, Michael D.; Castro, Victor M.; Chen, Michelle; Emery, Maurice; Gustafsson, Sonja; Hale, Clarence; Hickman, Dean; Homan, Evert; Jordan, Steven R.; Komorowski, Renee; Li, Aiwen; McRae, Kenneth; Moniz, George; Matsumoto, Guy; Orihuela, Carlos; Palm, Gunnar; Veniant, Murielle; Wang, Minghan; Williams, Meredith; Zhang, Jiandong
Journal of Medicinal Chemistry, 2008 , vol. 51, # 10 p. 2933 - 2943

Youssef, Amal Mamdouh; Safo, Martin K.; Danso-Danquah, Richmond; Joshi, Gajanan S.; Kister, Jean; Marden, Michael C.; Abraham, Donald J.
Journal of Medicinal Chemistry, 2002 , vol. 45, # 6 p. 1184 - 1195

Groebel,B.-T. et al.
Synthesis, 1976 , p. 121 - 123