.alpha.,.alpha.'-Diglycerol 1,2-Propanediol, 3,3'-oxybis- 1,2-Propanediol, 3,3'-oxydi- 3,3'-Oxydi-1,2-propanediol 4-Oxaheptane-1,2,6,7-tetrol 627-82-7 Diglycerine Diglycerol NSC8689