\decaheterov[egi]{1==$\rm\bm\,I$;4==O;
2s==\sixheterov[bdf]{
2s==\tetramethylene{4==CO$\bf_2$H}{1==(yl);3Sd==H;3Su==NH$\bf_2$}
}{4==$\rm\bm\,I$;6==(yl)}[e]
}{6==$\rm\bm\,I$;7==HO;8==$\rm\bm\,I$}[j]
\decaheterov[egi]{1==$\rm\bm\,I$;4==O;
2s==\sixheterov[bdf]{
2s==\tetramethylene{4==CO$\bf_2$H}{1==(yl);3Sd==H;3Su==NH$\bf_2$}
}{4==$\rm\bm\,I$;6==(yl)}[e]
}{6==$\rm\bm\,I$;7==HO;8==$\rm\bm\,I$}[j]