The chelate was recrystallized twice by the following procedure. Ten g. of the compound was dissolved in 100 ml. of methanol by gentle heating. The warm solution was filtered and 30 ml. of water added. The mixture was cooled several hours in the refrigerator and the product filtered off, airdried and finally dried for four hours at 100°. The recovery was 80% of the crude product taken; m.p. 198-199°( lit.