locant


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lo·cant

(lō'kant),
A number or letter preceding a substituent name in the name of a complex chemical that specifies the position (location) of the substituent on the parent molecule, for example, 5 in 5-methyluridine, S in S-adenosylmethionine.

locant

[lō′kənt]
a number or letter code that locates the position of an atom, radical, or compound in the structure of a more complex molecule.
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