... (5) Fergusson, P. J.; Cass, CE Cancer Res. 1986,45, 6480. 0022-2623/91/1834-1998$02.50/ 0 Q 1991 American Chemical Society Page 2. Vinblastine a-Amino Phosphonic Acid Derivatives chart I Journal of Medicinal Chemistry, 1991, Vol. 34, No. 7 1999 Scheme I ...