Typical previous skeletons with three or four coplanar M–C σ bonds and the skeletons in this study. (IMAGE)

Science China Press

Typical previous skeletons with three or four coplanar M–C σ bonds and the skeletons in this study.

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Skeletons I-V containing three or four coplanar M–C σ bonds are shown on the left. The two skeletons with five coplanar M–C σ bonds are placed on the right. Art by Dafa Chen.

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Art by Dafa Chen.

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