2 ml saturated NaCl wasadded. Benzoyl-polyamines were extracted in 2 ml diethyl ether
and vortexed for 10 s. After centrifugation at 1500 g for 5 min
at 4 8C, 1 ml of the ether phase was collected, evaporated to
dryness under a stream of warm air, and redissolved in 100 ml
methanol.