“…The extract was washed, dried, and evaporated. The residue was chromatographed and eluted with benzene-acetone (1:1) to give trans-1b (0.49 g, 55%) as pale yellow crystals, mp 64-66 °C from ether-hexane; ir (potassium bromide): 3320 (NH 2 ), 3216 (NH 2 ), 1642 cm -1 (CON(CH 2 CH 3 ) 2 ); 1 H nmr (deuteriochloroform): δ 1.19 (t, J=7.0 Hz, 3H, CON(CH 2 CH 3 ) 2 ), 1.26 (t, J=7.0 Hz, 3H, CON(CH 2 CH 3 ) 2 ), 3.1-4.3 (broad s, 2H, NH 2 ), 3.46-3.50 (m, 4H, CON(CH 2 CH 3 ) 2 and CON(CH 2 CH 3 ) 2 ), 6.72-6.78 (m, 3H, Ar-H 2 and CH=CHCO), 7.15 (dd,J=7.5 and 7.5 Hz,1H,7.37 (d,J=7.5 Hz,1H,7.85 (d,J=15.5 Hz,1H,CH=CHCON); 13 C nmr (deuteriochloroform): δ 13.6 (q), 15.5 (q) Anal. Calcd.…”