GC Test Conditions: Column: DB-1 (100% -polydimethylsiloxane), Length: 30 m; I.D.: 0.25 mm; Film: 1.0 m; Injection temp.: 250 °C; Detector (FID) temp.: 275 °C; Column Temp.: 200 °C initial, programmed at 10 °C/min. to 250 °C; hold for 15 min; Sample: 0.2 l in DMF.