SEARCH Articles Figures Tables 1- Methyl-3-benzylidenepiperazine-2,5-dion 2,6-purine-dione 8-methyl 2- -4-methyl-1,2,4-oxadiazolidine-2,5-dione 3- 5-methyl-13-oxazolidine-2,4-dione 3- methyl]cyclohexane-1,2-dione 4- Methyl-1,2,4-triazoline-3,5-dione 4- methyl-4-phenyl-oxazolidin-2,5-dione 4-Methyl-l ,2,4-triazoline-3,5-dione 4.5- Pyridazyne-dion-3,6, l-methyl-2phenyl 6 -methyl-morpholine-2,5-dione 6-Hydroxy-3-methyl-2-methylthio-4 dione Oxazolidine-4,5-dione, methylation Pteridine-2,4-dione, methylation Pyrazolidine-3,5-diones, methylation Quinoline-2,4-dione, methylation Quinoxaline-2,3-diones methylation Thiazolidine-2,4-diones, methylation