Acknowledgments.-We wish to thank Dr. Ross H. Hall for advice and Dr. Charles -4. Sichol for dis- cussions and encouragement. This work was supported in part by a research grant (CX-05697) from the Xa- tional Cancer Institute, C. S. Public Health Service. ... Substitution in the Hydantoin Ring. I. 3-3-Aminomethyl Derivatives ... MELDRUM B. ITISSTEAD, DONALD E. BARR, CCILEAMS R. HAMEL, 1). JAMES RESN, HARRIET I. PARKER, AKD ...