1,2,5,6-Tetrahydro-2,2,4,6,6-pentamethylpyrimidine 2,2,4,6,6-Pentamethyltetrahydro pyrimidine 2,3,4,5-Tetrahydro-2,2,4,4,6-pentamethylpyrimidine 5-23-04-00066 (Beilstein Handbook Reference) 556-72-9 Acetonin Acetonine BRN 0115247 EINECS 209-139-3 Pyrimidine, 1,2,5,6-tetrahydro-2,2,4,6,6-pentamethyl- Pyrimidine, 2,2,4,6,6-pentamethyl tetrahydro-