heptacyclic

== English == === Etymology === From hepta- +‎ cyclic. === Adjective === heptacyclic (not comparable) (chemistry) Formed of seven rings Aldrichimica Acta Volume 30 No 4 (pdf) from Sigma-Aldrich Reaction of quadricyclane with Smith’s diene produces the hexacyclic structure 8, while controlled Mitsudo cycloaddition of DMAD onto 8 can be used to form the heptacyclic system 9.