4-Hydroxybenzaldehyde

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What Wikipedia says

4‑Hydroxy­benzaldehyde (para‑hydroxy­benzaldehyde) is an organic compound with the formula C6H4OH(CHO). Along with 2-hydroxybenzaldehyde and 3-hydroxybenzaldehyde, it is one of the three isomers of hydroxybenzaldehyde.

Excerpt from the Wikipedia article “4-Hydroxybenzaldehyde”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Leiem, CC BY-SA 4.0, via Wikimedia Commons.