was shaken with 10 ml of h 2 o to extract the product and eliminate the lipophilic impurities in ch 2 cl 2 161 mg 0 21 mmol 24 of a yellow solid were obtained t dec 189 u00b0 c elemental analysis calculated c 57 02 h 5 93 n 7 39 found c 56 98 h 5 92 n 7 38 2 h 2 o 1 h nmr 300 mhz dmso u03b4 0 90 1 00 t 3h ch 3 1 50 s 9h tbu 1 80 1 95 quintet 2h ch 2 2 10 2 20 q 2h ch 2 2 60 2 70 t 2h ch 2 3 10 s 9h nme 3 3 20 3 40 t 4h 2 u00d7 ch 2 4 05 4 15 t 2h ch 2 4 35 4 45 m 1h ch 5 30 s 2h ch 2 5 50 s 2h ch 2 7 10 s 1h ch 7 70 7 80 t 1h ch 7 85 7 95 t 1h ch 8 15 8 20 d 1h ch 8 55 8 65 d 1h ch 9 30 s 1h ch 13 c nmr 75 4 mhz dmso u03b4 8 2 24 4 28 0 28 2 30 5 31 0 53 3 54 1 62 9 63 7 67 0 69 9.