3-(2,4-dihydroxyphenyl)-6-hydroxy-3H-1-benzofuran-2-one

propyl 2,2-dipropoxyacetate

butyl 2,2-dibutoxyacetate

carbamimidoylhydrazono,acetic acid

methyl 2-(2-hydroxynaphthalen-1-yl)-2-methoxyacetate