Citric

Pineapple is rich in citric acid.

Lemons contain citric acid.

If you're worried about your socks smelling, dipping them in citric acid solution might do the trick.

Citric acid used to give me migraines.

An orange-scented road to Harbor was what Christine expected, because three times the aroma had accompanied her escapes. The first was on foot, the second by bus, and each time the orange trees lining the road marked her flight with a light citric perfume.