2-(3,4-dihydroxyphenyl)-2-hydroxyacetaldehyde 2-(3,4-dihydroxyphenyl)-2-hydroxy-acetaldehyde 2-(3,4-dihydroxyphenyl)-2-hydroxy-ethanal 13023-73-9 3,4-Dihydroxyphenylglycolaldehyde Benzeneacetaldehyde, alpha,3,4-trihydroxy- 3,4-Dihydroxymandelaldehyde C05577