“…The solid was filtered, washed, and dried (280 g, 95%). Analysis by 1 H NMR (trifluoroacetic acid-d) gave a Glu/(Leu ϩ Glu) relative amount of 50 mol%: 0.9 -1.1 (0.5 ϫ 6H, Me-Leu), 1.5 (0.5 ϫ 3H, CHand CH 2 -Leu), 2.0 (1H, -CH 2 -Glu), 2.4 (1H, -CH 2 -Glu), 3.0 (2H, ␥-CH 2 -Glu), 3.5 (3H, MeO 2 C-Glu), 4.3 (0.5 ϫ 1H, ␣-CHLeu), 4.5 ppm (1H, ␣-CH-Glu).…”