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virtual OEAtomBase *GetBgn() const
Return the ``begin'' (or ``source'') atom of a bond. The begin atom of a
bond is defined either when the bond is created with
OEMolBase::NewBond, or possibly by a call to the
OEBondBase::SetBgn method. If the begin atom was specified as the
NULL pointer, (OEAtomBase*)0, when the bond was created, this
method may return a NULL pointer.
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