${\displaystyle {\ce {[R-{\overset {\oplus }{N}}{\equiv }{\overset {\ominus }{C}}{:}<->R-{\ddot {N}}=C{:}]}}}$

In your article, replace the image with:

<chem>[R-\overset{\oplus}N{\equiv}\overset{\ominus}C{:} <-> R-\ddot{N}=C{:}]</chem>

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