Purity by GC conditions: Column:DB 1(100% polydimethylsiloxane),Length: 30 m I.D.: 0.25 mm Film: 1.0 μmInjection temp.: 250 °CDetector(FID) temp.: 275 °CColumn Temp.: 150 °C initial, programmed at 10°C/min. to 250°Chold for 25 min.Sample: 0.2μl in DMF