1-Ethynyl-4-tert-butylbicycloorthocarboxylate 2,6,7-Trioxabicyclo(2.2.2)octane, 4-(1,1-dimethylethyl)-1-ethynyl- 97720-42-8 Orthopropiolic acid, cyclic ester with 2-tert-butyl-2-(hydroxymethyl)-1,3-propanediol