Nylon 6,6 (repeat unit from hexamethylenediamine + adipic acid) ([NH(CH2)6NH-CO(CH2)4CO]n)

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[NH(CH2)6NH-CO(CH2)4CO]n

What each symbol means

SymbolWhat it stands for
nNumber of repeat units

When to use this

Formed by condensation between −NH2 and −COOH; water eliminated; polyamide linkage.