2-Hydroxy-4,5,7-trimethyl-isoindole-1,3-dione

2-Hydroxy-6-methoxy-4,5-dimethyl-isoindole-1,3-dione

5,6,8-Trimethyl-2,3-dihydro-phthalazine-1,4-dione

6-Methoxy-4,5-dimethyl-isobenzofuran-1,3-dione

7-Methoxy-5,6-dimethyl-2,3-dihydro-phthalazine-1,4-dione