P 3390 (OTTO) Polyethylene glycol monomethyl ether 400 Cas 9004-74-4 - used in a study to assess the synthesis of a new class of thermosensitive micellar cyclotriphosphazenes. P 3390 (OTTO) Polyethylene glycol monomethyl ether 400 Cas 9004-74-4 - used in a study to investigate synthesis of a new amphiphilic poly(organophosphazene) by stepwise nucleophilic substitution.