“…H, 7.9; N, 3.8%); mp 86-88 ЊC (from EtOH) (lit., 16 89 ЊC); GLC (250 ЊC) t R 4.05 min; δ H (500 MHz; CDCl 3 ) 1.11 (3 H, t, J 7.1, NCH 2 CH 3 ), 2.48 (1 H, ddd, J 3.9, 4.4, 13.1, 4-Ha), 2.68 (2 H, q, J 7.1, NCH 2 CH 3 ), 2.72 (1 H, dd, J 7.8 and 13.5, 9-Ha), 2.79-2.89 (2 H, overlapping, 3-Ha and 4-Hb), 3.07 (1 H, dd, J 5.5 and 13.3, 9-Hb), 3.17 (16), 176 (6), 151 (9).…”