\xFiveCycle(0,0){0}[be]{3==\sffamily\bfseries N;4==\sffamily\bfseries\upnobond{N}{H};
1s==\exosinglebond{146}\put(-265,-210){\sffamily\bfseries H$\bf_3$C}
}[]
\decaheterov[]{3==N;4==O;6s==\dimethylene{}{2==(yl)}}{3D==O}[abhijk]
\xFiveCycle(0,0){0}[be]{3==\sffamily\bfseries N;4==\sffamily\bfseries\upnobond{N}{H};
1s==\exosinglebond{146}\put(-265,-210){\sffamily\bfseries H$\bf_3$C}
}[]
\decaheterov[]{3==N;4==O;6s==\dimethylene{}{2==(yl)}}{3D==O}[abhijk]