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Cahn–Ingold–Prelog priority rules
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== Relative configuration == The relative configuration of two [[stereoisomer]]s may be denoted by the descriptors ''R'' and ''S'' with an [[asterisk]] (*). (''R''*,''R''*) means two centers having identical configurations, (''R'',''R'') or (''S'',''S''); (''R''*,''S''*) means two centers having opposite configurations, (''R'',''S'') or (''S'',''R''). To begin, the lowest-numbered (according to IUPAC systematic numbering) stereogenic center is given the ''R''* descriptor. To designate two [[anomer]]s the relative stereodescriptors alpha (α) and beta (β) are used. In the α anomer the ''anomeric carbon atom'' and the ''reference atom'' do have opposite configurations (''R'',''S'') or (''S'',''R''), whereas in the β anomer they are the same (''R'',''R'') or (''S'',''S'').<ref>{{GoldBookRef|title=Relative Configuration|file=R05260}}</ref>
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