Container for all rings in the Structure.  Represents a dynamic list 
  of the smallest set of smallest rings (SSSR) in the structure.
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          | __init__(self,
        st) x.__init__(...) initializes x; see help(type(x)) for signature
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          | __len__(self) Return the number of rings in the structure.
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          | __getitem__(self,
        ringnum) Return ring object for ring <i>.
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          | __iter__(self) Iterate through all rings in the structure.
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          | _isAromatic(self,
        ring_atoms) Returns true if all of ring_atoms are aromatic
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    | Inherited from object:__delattr__,__format__,__getattribute__,__hash__,__new__,__reduce__,__reduce_ex__,__repr__,__setattr__,__sizeof__,__str__,__subclasshook__ |