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E-Z notation can be used to describe the configuration of a double bond with two or more substituents. To do so, each substituent is assigned a priority using the Cahn-Ingold-Prelog rules. If the two higher priority substituents are on same side of the double bond, the configuration of the bond is Z. If the two higher priority substituents are on opposite sides of the double bond, the configuration of the bond is E.
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