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How to add numbers to a structure

How to add numbers to a structure 1. Select the full structure or atom to number. 2. click ' (apostrophe) Note: Numbering will not be as per IUPAC numbering system. -----------------

I or U

❌I or U❌  ❗STR I CTURE = a restriction on a person or activity./ a sternly critical or censorious remark or instruction. ❗STR U CTURE = a building or other object constructed from several parts. / the arrangement of and relations between the parts or elements of something complex.