A chemical compound containing two naphthyl groups (naphthyl being derived from naphthalene, an aromatic hydrocarbon).
From 'di-' (two) + 'naphthyl' (a radical derived from naphthalene, from Greek 'naphtha'). Chemistry nomenclature combining prefix and chemical radical name.
Organic chemists speak in building blocks—dinaphthyl is literally two naphthalene pieces stuck together, and they describe molecules this way the same way LEGO builders describe their creations.
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