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You can define a new arrow type as explained in section 11 of part IV of the chemfig manual: \documentclass{article} \usepackage{chemfig} \makeatletter \definearrow{3}{-|>}{% \CF@arrow@shift@nodes{#3}% \expandafter\draw\expandafter[\CF@arrow@current@style,-CF] (\CF@arrow@start@node) -| (\CF@arrow@end@node) node[midway] (arrow@middle){} ;% ...



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