1118-71-4 139996-82-0 2,2,6,6-Tetramethyl-3,5-heptanedione 2,2,6,6-Tetramethylheptane-3,5-dione 3,5-Heptanedione, 2,2,6,6-tetramethyl- 61346-74-5 82846-74-0 Dipivaloylmethane EINECS 214-268-3 NSC 174296