“…The residue remaining crystallized to give 2.12 g (81.6%) of tan solid, mp 135-144°. Two recrystallizations from EtOH (5 ml/g) gave 1.43 g (55.0%) of white solid: mp 147.5-148.5°; ir (KBr) 3510 (OH), 3330 (NH), 1335, 1156 cm"1 (CS02); uv max 215 nm (e 30,800), 243 (18,300), 307 (4920); nmr (CDClg) 2.35 (s, 3, TsCHg), 3.26 (m, 2, NCH2), 3.47 (m, 2, CH20), 4.11 (m, 1, NCH), 2.9-3.6 (br m, 2, NH and OH), 6.4-7.7 (m, 8, aromatic); nmr (DMSO-de) 4.84 (t, J = 5.5 Hz, 1, OH), 5.88 (br s, 1, NH).…”