I'm having trouble writing the arrows below, can someone help me?

enter image description here

  • Problem solved? Apr 24 at 16:06
  • Yes, thank you for the answers. Apr 24 at 20:50
  • 2
    Then please consider accepting one of the answers. This is the "normal" procedure here in order to "close" a question. Apr 24 at 21:05
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    So far you did not accept a single answer. By accepting an answer you show other readers that the answer was helpful and you show "thanks" to the author of the helpful answer. Apr 24 at 21:18

A suggestion in chemfig without subscheme:



\arrow(.mid east--.mid west){<->>}

enter image description here

  • 1
    I have not seen your very nice answer. +1
    – Sebastiano
    Apr 9 at 22:22

I found a way to do this, using subschemes. The vertical arrow leaves the middle of the upper subscheme and points to the middle of the lower subscheme.




















The result is:

enter image description here

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