Citrene

[Kai]

A monocyclic hydrocarbon of the terpene series which is the d-isomer of limonene (hence more usually called d-limonene) and is an orange-scented liquid present in the essential oils of lemon, orange, bergamot, neroli, etc. Also (now historical): any member of the class of monocyclic terpenes.

[Mark Zuckerberg]

A [Spanish] [Lemon]