Vanillin

Note: In a structure of this type, H atoms are white, carbons are grey, and oxygen atoms are red

CxHyOz,
No double or delocalized bonds are shown
Reference: R. Velavan, P. Sureshkumar, K. Sivakumar,
S. Natarajan, Acta Cyrstallogr., Sect.C: Cryst. Struct. Commun.,
Vol 51, 1995, p. 1131 CCDC Ref: YUHTEA

CxHyOz,
Localized double bonds are shown

CxHyOz,
Here the bonds are shown representing the delocalization of electrons (from resonance)
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