Because it is a source of endless confusion, particularity for scholars who have thought about chiastic structures to some extent, the following comment is made pinpointing the difference between a chiasm and branch paired Menorah structure:

A chiasm, (a-b-c-x-c’-b’-a’) when it is truly a chiasm, may sometimes be a Menorah pattern or structure when it has seven parts, such as seven verses or seven stanzas.  However, a branch paired Menorah structure is typically of the form (aa, bb, cc, d) where (aa) for example is a pair of branches such as outer branches and (bb) are intermediate or middle branches, and (cc) are inner branches.  (aa) or (bb) or (cc) may by themselves contain chiastic or parallel structures but the entire branch paired Menorah structure is not a chiasm.  While a chiasm has a center, the line of symmetry for a branch paired Menorah is distributed through the text (i.e., through the centers of aa, bb, and cc).   

In summary a chiasm can sometimes correspond to a Menorah, but a branch paired menorah structure overall is not a chiasm.   This is a key thing to understand.