1-Ethynyl-4-isopropylbicycloorthocarboxylate 2,6,7-Trioxabicyclo(2.2.2)octane, 1-ethynyl-4-(1-methylethyl)- 97720-41-7 Orthopropiolic acid, cyclic ester with 2-(hydroxymethyl)-2-isopropyl-1,3-propanediol