![\trimethylene{1==H;2==\rightlonepairover{\leftlonepairover{O}{ $ $ }}{ $ $ };3s==\sixheterov[ace]{}{6==(yl)}[]}{}\qquad\sixheterov[ace]{2s==\dimethylene{2==\rightlonepairover{\leftlonepairover{O}{$ $}}{$ $}}{1==(yl);2W==H}}{}[]](https://gaia-sb.iwate-med.ac.jp/pharm/filter/tex/pix.php/b0eeb3b735eb0f5c9bce6a7ed2ae6bc8.svg "\trimethylene{1==H;2==\rightlonepairover{\leftlonepairover{O}{ $ $ }}{ $ $ };3s==\sixheterov[ace]{}{6==(yl)}[]}{}\qquad\sixheterov[ace]{2s==\dimethylene{2==\rightlonepairover{\leftlonepairover{O}{$ $}}{$ $}}{1==(yl);2W==H}}{}[]")
\trimethylene{1==H;2==\rightlonepairover{\leftlonepairover{O}{ $ $ }}{ $ $ };
3s==\sixheterov[ace]{}{6==(yl)}[]
}
{}
\sixheterov[ace]{
2s==\dimethylene{2==\rightlonepairover{\leftlonepairover{O}{$ $}}{$ $}}{1==(yl);2W==H}
}{}[]
\trimethylene{1==H;2==\rightlonepairover{\leftlonepairover{O}{ $ $ }}{ $ $ };
3s==\sixheterov[ace]{}{6==(yl)}[]
}
{}
\sixheterov[ace]{
2s==\dimethylene{2==\rightlonepairover{\leftlonepairover{O}{$ $}}{$ $}}{1==(yl);2W==H}
}{}[]