def bonds(self):
        """List of :class:`Bonds <pubchempy.Bond>` between :class:`Atoms <pubchempy.Atom>` in this Compound."""
        return sorted(self._bonds.values(), key=lambda x: (x.aid1, x.aid2))
List of :class:`Bonds <pubchempy.Bond>` between :class:`Atoms <pubchempy.Atom>` in this Compound.