2,2'-Diisopropoxy-5,5'-methyl-enedi-benz-alde-hyde.

Mol­ecules of the title compound, C21H24O4, are located on a twofold rotation axis running through the central methyl­ene C atom. The aldehyde group is coplanar with the benzene ring [C—C—C—O = 175.7 (4) °].