\chemfig{
           H% 8
    -[:180]% 1
   =_[:240]% 2
              (
        -[:300]H% 9
              )
    -[:180]% 3
              (
        -[:240]H% 10
              )
   =_[:120]% 4
              (
        -[:180]O% 7
        -[:120]H% 13
              )
     -[:60]% 5
              (
        -[:120]H% 11
              )
         =_% 6
              (
        -[:300]% -> 1
              )
     -[:60]H% 12
}

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