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I'd draw the bold single bonds with the line-width command -[,,,,line width=2pt]. A bold double bond can be achieved by drawing a bold single bond backwards (angle = 180°) over the double bond: -[::180,,,,line width=2pt]. Here is an example: \documentclass[a4paper]{scrreprt} \usepackage[utf8]{inputenc} \usepackage{chemfig} ...


The trick is to use invisible bonds. The lenght of a 6-ring is 2 bonds: \documentclass{article} \usepackage{chemfig} \begin{document} \setatomsep{1.75em} \chemfig{C(-[4,2]**6(---(-[,3,,,draw=none])---))(=[6]O)-O?-[,4,,,draw=none]?*6(---N(-CH_3)---)}\vskip5ex ...

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