${\displaystyle {\ce {H{:}{\overset {\displaystyle H}{\underset {\displaystyle {\ddot {H}}}{\ddot {C}}}}{:}H}}}$

In your article, replace the image with:

<chem>H{:}\overset{\displaystyle H }{\underset{ \displaystyle \ddot{H} }{\ddot{C} } }{:}H</chem>

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