5,5-Dimethylpiperidine-2,4-dione118263-81-3100 % similar 2,2,6,6-Tetramethyl-3,5-heptanedione1118-71-437 % similar 1,1,1-Trifluoro-5,5-dimethyl-2,4-hexanedione22767-90-430 % similar Pivaloylacetonitrile59997-51-230 % similar