sodium,7-oxocyclohepta-1,3,5-trien-1-olate

2-hydroxy-5-methylcyclohepta-2,4,6-trien-1-one

azanium,4-hydroxy-5-oxocyclohepta-1,3,6-triene-1-sulfonate

5-(hydroxymethylidene)cyclohepta-3,6-diene-1,2-dione

4-hydroxy-5-oxocyclohepta-1,3,6-triene-1-carboxylic acid