3-(1,3-dihydrobenzimidazol-2-ylidene)chromene-2,7-dione

(4-formyl-3-hydroxyphenyl) 4-ethoxybenzoate

(4-formyl-3-hydroxyphenyl) 4-pentoxybenzoate

2,4-bis[2-[2-(2-hydroxyethoxy)ethoxy]ethoxy]benzaldehyde

3-hydroxy-4-[(naphthalen-2-ylamino)methylidene]cyclohexa-2,5-dien-1-one