3,6,9,12,15,18,21-Heptaoxatritriacontan-1-ol 3055-97-8 EINECS 221-283-9 Laureth-7 Lauryl alcohol hexa(oxyethylene) ethanol PEG-7 Lauryl ether Polyethylene glycol (7) lauryl ether Polyoxyethylene (7) lauryl ether