Cetomacrogol 1000 B.P.C.' hasthe general formula CHa. (CH2)m[0.CH~.CHz],.OH, where NZ may be 15or 17 and 9~ may be 19 to23. The molecular weight was taken as 1300.Solutions of cetomacrogol were passed through acolumn of mixed bed ion-exchange resins to removealkaline impurities (6)