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

enter image description here

  • Problem solved? Commented Apr 24, 2021 at 16:06
  • Yes, thank you for the answers.
    – CrocoDuck
    Commented Apr 24, 2021 at 20:50
  • 2
    Then please consider accepting one of the answers. This is the "normal" procedure here in order to "close" a question. Commented Apr 24, 2021 at 21:05
  • 2
    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. Commented Apr 24, 2021 at 21:18

2 Answers 2


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
    Commented Apr 9, 2021 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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