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virtual bool SetEnd(OEAtomBase *end)
Define the ``end'' (or ``destination'') atom of a bond. Normally, the end
atom of a bond is defined when the bond is created with
OEMolBase::NewBond. However, it is occasionally useful to defer
this decision, by passing the NULL pointer, (OEAtomBase*)0, as the
end atom to OEMolBase::NewBond. The end atom should then later be
specified by calling this method, OEBondBase::SetEnd, to resolve
the end atom before the molecule is used. Note that it is not possible to
set/change the end atom of a bond, once it has been defined. To
achieve the same behavior call the OEMolBase::DeleteBond method,
followed by OEMolBase::NewBond, to first destroy the original and
replace it with a new bond.
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