Olson, Gary L.; Cheung, Ho-Chuen; Morgan, Keith D.; Blount, John F.; Todaro, Louis; et al.
Journal of Medicinal Chemistry, 1981 , vol. 24, # 9 p. 1026 - 1034

Coffen, David L.; Hengartner, Urs; Katonak, David A.; Mulligan, Mary E.; Burdick, David C.; et al.
Journal of Organic Chemistry, 1984 , vol. 49, # 26 p. 5109 - 5113

Coffen, David L.; Hengartner, Urs; Katonak, David A.; Mulligan, Mary E.; Burdick, David C.; et al.
Journal of Organic Chemistry, 1984 , vol. 49, # 26 p. 5109 - 5113