\octamethylene{1==H$\bf_3$C;3==\downnobond{N}{H};7==O;
8s==\sixheterov[bdf]{
2s==\tetramethylene{4==NH$\bf_2$}{1==(yl);3D==O}
}{5==(yl)}[]
}{2==CH$\bf_3$;5Sd==HO;5Su==H}
\octamethylene{1==H$\bf_3$C;3==\downnobond{N}{H};7==O;
8s==\sixheterov[bdf]{
2s==\tetramethylene{4==NH$\bf_2$}{1==(yl);3D==O}
}{5==(yl)}[]
}{2==CH$\bf_3$;5Sd==HO;5Su==H}