virtual const char *GetType() const
Return the ``atom type name'' string of an atom. This value is
typically used when reading and writing molecular formats. For
example, in Sybyl mol2 file, the atom type name ``N.pl3'' means that the
atom should be treated as a three-valent planar nitrogen. The default
value is the empty string. The atom type name property may be set
using the OEAtomBase::SetType
method.