2 hours while maintaining the reaction system at 60 u00b0 c next the reaction was carried out for 10 hours at 60 u00b0 c after the completion of the reaction the solvent was distilled off under reduced pressure and the residue was washed with 10 times of acetone as much as the residue by volume to thereby remove the unreacted glycidyldimethylhexadecylammonium chloride and the epoxy ring opened product thereof the crude product thus obtained was washed with a 90 aqueous solution of ethanol and then purified in the similar method as described in example 6 until a single spot was obtained in thin layer chromatography thus 5 6 g of 2 3 4 5 6 pentahydroxyhexyl 2 hydroxy 3 n n dimethyl n hexadecylammonio propyl phosphate was obtained in a pure form isolation yield 30 1 h nmr d 2 o u03b4 ppm 0 87 t 3h a 1 29 broad 26h b 1 75 m 2h c 3 16 s 6h d 3 20 4 00 m 14h e 4 34 broad 1h f str17 8 9 g 0 032 mol of sodium salt of sorbitol phosphate prepared in accordance with synthetic example 1 as will be given below and 100 g of water were introduced into a reaction vessel after adjusting the ph value to 6 5 with a dilute hydrochloric acid the solution was heated to 60 u00b0 c then a solution of 10 g 0 048 mol of glycidyldimethylpentylammonium chloride dissolved in 100 g of a 30 aqueous solution of ethanol was slowly added thereto dropwise over 2 hours while maintaining the reaction system at 60 u00b0 c next the reaction was carried out for 9 hours at 60 u00b0.