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As I'm sure you know when you have used chemfig already the bonds have optional arguments. The manual says: 6 Customization of bonds There is a fifth and last optional argument for bonds which is found after the fourth comma: [,,,,<tikz code>] This means all you have to do is adding the TikZ code for not-drawing: \chemfig{-C-[,,,,draw=...

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As I'm sure you know when you have used chemfig already the bonds have optional arguments. The manual says: 6 Customization of bonds There is a fifth and last optional argument for bonds which is found after the fourth comma: [,,,,<tikz code>] This means all you have to do is adding the TikZ code for an arrow: \documentclass{article} \...

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The parentheses ( and ) are special characters inside \chemfig. They denote branching (and also are part or the ring syntax). \chemfig{(Si)} starts a branch after an empty atom which in effect seems to shift the baseline. \documentclass{article} \usepackage{chemfig} \begin{document} X\chemfig{H-C-H}X\chemfig{C}X \par X\chemfig{-C-}X\chemfig{(C)}X \end{...

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