4-hydroxy-6-pentylpyran-2-one

(3E)-3-[1-(2-amino-4-methylanilino)ethylidene]-6-methylpyran-2,4-dione

(3E)-3-[1-(2-amino-4-chloroanilino)ethylidene]-6-methylpyran-2,4-dione

5-bromo-4-methoxy-6-methylpyran-2-one

4-hydroxy-7-methylpyrano[3,2-c]pyran-2,5-dione