TLC: Rf = 0.45 [S1], yield: 53% (Procedure B), 65% (Procedure C); m.p. 120˚C - 122˚C. IR ν (cm−1): 3370 (NH), 1670 (C=O amide). 1H NMR (DMSO-d6, δ, ppm): 2.37 - 2.47 (m, 4H, 2CH2, Pip-H), 3.35 - 3.46 (m, 4H, 2CH2, Pip-H), 3.96 (s, 2H, COCH2), 6.23 - 6.33 (m, 2H, Ph-H), 6.84 (d, J = 16 Hz, 1H, =CHCO), 6.99 - 7.05 (m, 2H, Ph-H), 7.06 (t, J = 3.5 Hz, 1H, Th-H4), 7.19 (d, J = 5 Hz, 1H, Th-H3), 7.3 (d, J = 16 Hz, 1H, CH=CH), 7.4 (d, J = 5 Hz, 1H, Th-H5), 8.14 (s, 1H, NH, exchangeable with D2O). Mass: m/z 374 ([M+1]+, 14%). Calcd. For C19H20FN3O2S (373.44). Calcd. C 61.11, H 5.40, N 11.25, S 8.59. Found: C 60.98, H 5.32, N 11.39, S 8.67.