The Cahn—Ingold—Prelog CIP sequence rules , named for organic chemists Robert Sidney Cahn , Christopher Kelk Ingold , and Vladimir Prelog — alternatively termed the CIP priority rules , system , or conventions — are a standard process used in organic chemistry to completely and unequivocally name a stereoisomer of a molecule. A molecule may contain any number of stereocenters and any number of double bonds , and each usually gives rise to two possible isomers. The key article setting out the CIP sequence rules was published in ,  and was followed by further refinements,   before it was incorporated into the rules of the International Union of Pure and Applied Chemistry IUPAC , the official body that defines organic nomenclature. A recent paper argues for changes to the specific rules to accommodate for certain structures, after they found deficiencies in some of the CIP rules sequence rules 1b and 2.
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Cahn–Ingold–Prelog priority rules
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Reglas Cahn Ingold Prelog