arlacel 985 brij 72 brij S2 hetoxol STA-2 lipocol S-2 nikkol BS-2 2- octadecoxyethanol (peg-2) peg-2 stearyl ether poly(oxy-1,2-ethanediyl), .alpha.-octadecyl-.omega.-hydroxy- (2 mol EO average molar ratio) polyethylene glycol (2) stearyl ether polyoxyethylene (2) stearyl alcohol ether polyoxyethylene (2) stearyl ether tego alkanol S 2 P cas:9005-00-9