... Acta Chem. ... 16' Acta Chemica Scandinavica B40 (1986) 235—241 region 19—25, Asp-Asp-Tyr-Arg-Gln-Lys, com- mon for the variants ab, ac ... less favourable protection of arginine as Arg(N02) and Arg(Tos) derivatives in connection with ben~ zyl based side-chain protection. ...