isomers
isomers Molecules containing the same atoms but differently arranged, so that the chemical and biochemical properties differ.(1)In positional isomers the functional groups are on different carbon atoms; e.g. leucine and isoleucine.(2)d‐ and l‐isomerism refers to the spatial arrangement of four different chemical groups on the same carbon atom (stereo‐isomerism or optical isomerism). r‐ and s‐isomerism is the same, but determined by a set of systematic chemical rules. See D‐.(3)Cis‐ and trans‐isomerism refers to the arrangement of groups adjacent to a carbon‐carbon double bond; in the cis‐isomer the groups are on the same side of the double bond, while in the trans‐isomer they are on opposite sides.
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isomers
