= Stereochemical sequence rule
<Stereochemical sequence rules> rank <substituents> for <R and S configuration>. Compare the directly attached <chemical atoms> by <atomic number> first, then resolve ties by comparing successive shells at the first difference. <Isotopes> and multiple <chemical bonds> require additional rules. This ranking convention does not involve <optical rotation>.<Organic Chemistry by John McMurry/5.5 Sequence Rules for Specifying Configuration>[McMurry, Organic Chemistry, §5.5, Rules 1–3]{ref}
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