Guaifenesin Standard

3-(o-Methoxyphenoxy)-1,2-propanediol; Glycerol guaiacolate; Guaiacol Glyceryl Ether; (2RS)-3-(2-Methoxyphenoxy)propane-1,2-diol; (RS)-3-(2-Methoxyphenoxy)propane-1,2-diol; (±)-3-(o-Methoxyphenoxy)-1,2-propanediol; 1,2-Propanediol, 3-(2-methoxyphenoxy)-(±) (USP);