were stirred at room temperature for 6 hours as in example 1 there were obtained 89 7 g 83 yield of while crystals having a maximum absorption at 266 nm decomp 172 u00b0 175 u00b0 c ir spectrum is as shown in fig3 the crystals were dissolved in water at a rate of 350 g l 72 1 g 0 55 mol of 6 amino n caproic acid 74 8 g 0 55 mol of sodium acetate 54 1 g 0 5 mol of thiourea dioxide and 100 ml of water were stirred at room temperature for 8 hours as in example 1 there were obtained 64 7 g 53 yield of white crystals having a maximum absorption at 272 nm decomp 170 u00b0 172 u00b0 c ir spectrum is as shown in fig4 the crystals were dissolved in water at a rate of 380 g l 41 3 g 0 55 mol of glycine 54 0 g 0 55 mol of potassium acetate 54 1 g 0 5 mol of thiourea dioxide and 100 ml of water were stirred at room temperature for 6 hours as in example 1 there were obtained 76 6 g 75 yield of white crystals having a maximum absorption at 262 nm decomp 135 u00b0 138 u00b0 c ir spectrum is as shown in fig5 the crystals were dissolved in water at a rate of 490 g l 0 41 3 g 0 55 mol of glycine.