... ACCA was synthesized by hydrogenation of p-ami- nobenzoic acid with PtOz as a catalyst17 (Scheme I), which Q 1993 American Chemical Society Page 2. ... Tyr-Gly-Gly-Phe-Leu-Arg-Arg- lle-Arg-R Dyn A-(1-1 3)NH2 Journal of Medicinal Chemistry, 1993, Vol. 36, No. ...