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.