SEARCH Articles Figures Tables 1,3-Dimethyl-4,8-dioxo-5,7-diphenyl 1.1- dichloro-2,4-dimethyl-3,5-dioxo 1.3- Dimethyl-2,4-dioxo-6- -1,2,3,4-tetrahydro 2.4- Dioxo 2.6- dimethyl-3,5-dioxo-4-ethyl 4.4- dimethyl-2,6-dioxo-1 -(methyl 5,7-Dimethyl-4,6-dioxo-3-methoxycarbonyl