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virtual bool IsRotor() const
Determine whether a bond is freely rotatable. The definition of a
freely rotatable bond is that it is a single, non-ring bond between
two non-terminal, non-triple-bonded atoms. An atom is considered
non-terminal if it is connected to two or more non-hydrogen atoms,
i.e. OEAtomBase::GetHvyDegree >= 2. Note that the
``in ring'' property of the bond must have previously been set using the
OEBondBase::SetInRing method, typically by calling the function
OEFindRingAtomsAndBonds.
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