2,4,4,6-Tetramethyl-4,5-dihydro-1,3-oxazine 26939-18-4 4H-1,3-Oxazine, 5,6-dihydro-2,4,4,6-tetramethyl- 5,6-Dihydro-2,4,4,6-tetramethyl4H-1,3-oxazine EINECS 248-117-8