locant


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locant

[′lō‚kant]
(chemistry)
The portion of a chemical name, usually a number or a letter, that designates the position of an atom or group of atoms in a formula unit.
References in periodicals archive ?
The locant 2 may be omitted if no ambiguity can arise, especially in a biochemical context.
Among the improvements are uniformly cited locants, a reduction in the number of stereoparent names, and the elimination of nearly 3,000 obscure stereoparents.