2-Chloro-5-methyl-1,4-benzoquinone19832-87-247 % similar 2,6-Diisopropyl-1,4-benzoquinone1988-11-039 % similar Methyl-1,4-benzoquinone553-97-939 % similar 2,3-Dimethoxy-5-methyl-1,4-benzoquinone605-94-733 % similar 2,6-Dimethyl-3,5-heptanedione18362-64-631 % similar