\trimethylene{1==H;2==N\put(-75,-30){..};
3s==\sixheterov[ace]{}{6==(yl)}[]
}
{2==H}
\sixheterov[ace]{
2s==\dimethylene{2==N\put(-75,-30){..}}{1==(yl);2==H;2W==H}
}{}[]
\trimethylene{1==H;2==N\put(-75,-30){..};
3s==\sixheterov[ace]{}{6==(yl)}[]
}
{2==H}
\sixheterov[ace]{
2s==\dimethylene{2==N\put(-75,-30){..}}{1==(yl);2==H;2W==H}
}{}[]