What is the “single structural similarity” requirement for Markush groups?

What is the “single structural similarity” requirement for Markush groups? The “single structural similarity” requirement for Markush groups refers to a common structure or feature shared by all members of the group. According to MPEP 2117, this requirement is essential for a proper Markush grouping: “Members of a Markush group share a ‘single structural similarity’…

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