\chemfig{
                    O% 2
            =[:45.1]% 12
       -[:0.2,1.008]N% 6
              -[:90]% 8
                       (
                  -[:18]S% 1
                 -[:306]% 9
                           (
                      -[:36]% 13
                           )
                           (
                     -[:324]% 14
                           )
                 -[:234]% 10
                           (
                    <:[:288]% 15
                               (
                         =[:348]O% 4
                               )
                 -[:228,,,2]HO% 3
                           )
                 -[:162]\phantom{N}% -> 6
                       )
     -[:179.8,1.008]% 11
                       (
           -[:270,1.008]% -> 12
                       )
           <[:134.9]\mcfabove{N}{H}% 7
           -[:209.8]% 16
                       (
               =[:269.8]O% 5
                       )
           -[:149.8]% 17
           -[:209.8]% 18
           -[:149.8]% 19
    -[:209.8,,,,dlh]% 21
           -[:269.8]% 23
    -[:329.8,,,,dlh]% 22
            -[:29.8]% 20
                       (
         -[:89.8,,,,dlh]% -> 18
                       )
}
