.beta.-Propylene glycol .omega.-Propanediol 1,3-Dihydroxypropane 1,3-Propanediol 1,3-Propylene glycol 1,3-Propylenediol 2-(Hydroxymethyl)ethanol 2-Deoxyglycerol 504-63-2 NSC65426 PG Propane-1,3-diol Trimethylene glycol