39 4 39 5 39 trimethoxybenzoyloxy 2 butyl ethylenediamine dioxalate monohydrate with a melting point of 100 u00b0 102 u00b0 c to a solution of 0 79 g of l n n 39 dimethyl n n 39 bis 1 3 39 4 39 5 39 trimethoxybenzoyloxy 2 butyl ethylenediamine in 8 ml of ethanol a solution of 0 53 g of p toluenesulfonic acid in 3 ml of ethanol is added dropwise the product is separated after cooling to a temperature of about 10 u00b0 c 0 79 g of l n n 39 dimethyl n n 39 bis 1 3 39 4 39 5 39 trimethoxybenzoyloxy 2 butyl ethylenediamine di p toluenesulfonate having a melting point of 171 u00b0 172 u00b0 c is obtained into a solution of 1 g l n n 39 dimethyl n n 39 bis 1 3 39 4 39 5 39 trimethoxybenzoyloxy 2 butyl ethylenediamine in 10 ml of ethanol a solution of 0 98 g of 5 sulfosalicylic acid in 5 ml of ethanol was added at a temperature of about 10 u00b0 c colorless crystalline l n n 39 dimethyl n n 39 bis 1 3 39 4 39 5 39 trimethoxybenzoyloxy 2 butyl ethylenediamine bis 5 sulfosalicylate separates in a yield of 1 42 g to a solution of 7 g 0 03 mole of d.