Ethyl maltol4940-11-8100 % similar Maltol118-71-855 % similar 5,7-Dihydroxychromone31721-94-533 % similar 3-Hydroxy-4-pyrone496-63-933 % similar Maltol propionate68555-63-533 % similar Deferiprone30652-11-033 % similar Chromone491-38-332 % similar 2-Ethylfuran3208-16-031 % similar