... (b) Pre- sented in part before the Division of Medicinal Chemistry, 155th National Meeting of the American Chemical Society, San Francisco, Calif., Spril 1968, R- Pi-59. (2) E. Gellert and R. Rudzats. J. 'Wed. Chem., 7 , 361 (1964). ... 1 2 3 4 5 6 7 8 9 10 11 12 13 14 I 3 16 ...