1.2.1.7 4 - 4-hydroxybenzaldehyde 1.2.1.7 4.6 - benzaldehyde 1.2.1.7 14 - NAD+ 1.2.1.7 18 - 4-hydroxy-3-methoxybenzaldehyde 1.2.1.7 25 - 3,4-Dihydroxybenzaldehyde