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III (6.0 g, 0.0148 mole) was deblocked with HCl/Dioxane and solvent removed under reduced pressure. The residue was triturated with ether, filtered, washed with ether, then pet. ether and dried. A very hygroscopic material was obtained (4.2 g, 0.0123 mole) which was coupled in DMF with II (2.86 g, 0.0123 mole) in the presence of 10% excess of EDCI (2.60 g) and HOBt (2.07 g). The reaction was worked up as described for I to obtain IV as a white foam in a quantitative yield, no sharp m.p. 54°-62° C. Rf2, 0.42; Rf3, 0.74. Anal. Calcd. for C26H38N4)7 ; C, 60.21; H, 7.38; N, 10.805. Found: C, 60.0; H, 7.46; N, 10.81%,

1. customremoved under reduced pressure
2. customThe residue was triturated with ether
3. filtrationfiltered
4. washwashed with ether
5. dry with materialpet. ether and dried
6. customA very hygroscopic material was obtained (4.2 g, 0.0123 mole) which