In this figure, what do the orange arrows marked #3 indicate? 
Definitions:
IUPAC Name
The systematic naming of chemical substances based on the rules established by the International Union of Pure and Applied Chemistry (IUPAC).
Compound
A compound formed by chemically joining atoms from more than one element.
2,3-dimethyl-2-butanamine
A branched aliphatic amine with a chemical formula C6H15N, where two methyl groups and an amine group are attached to a butane backbone.
Structure
The arrangement or organization of something, especially as it pertains to the arrangement of atoms in chemical compounds or the assembly of components in physical objects.
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