text: In organic chemistry, a<unk>  is one in which a series of carbon atoms are connected together to form a loop or ring. Benzene is a well known example.
  The term "polycyclic" is used when more than one ring is combined in a single molecule, and the term "macrocycle" is used for a ring containing more than a dozen atoms.
option_0: Cyclic compound
option_1: Heterocyclic compound
option_2: Polycyclic compound
option_3: Diradical
option_4: Biopolymer
option_5: Complex 
option_6: Organic compound
option_7: Metabolic intermediate