Succinylacetone derived or related medicaments and methods of synthesis of the same are shown wherein the medicaments consists of succinylacetonyl-proline-PEG, succinylacetonyl-NH-PEG, or compounds that have the formula: ##STR1## and that have immunosuppressive activity both in vivo and in vitro based on their activities in cellular immunologic assays and adjuvant induced arthritis in rats, respectively.
This application is a divisional of copending U.S. Patent application, Ser. No. 434,870, filed Nov. 13, 1989 now abandoned, which is a divisional application of its copending U.S. Ser. No. 324,360, filed Mar. 15, 1989, the latter has been issued as U.S. Pat. No. 4,895,872 on Jan. 23, 1990.
