What are the isoprene units in the given terpene?Take note that in terpenes with cross-links or rings, linkages between carbon atoms other than C1 and C4 of the isoprene unit are possible.

Chemical structure of a terpene with cross-links, showing isoprene units.

Chemical structure of a cyclic terpene, illustrating isoprene units.

Chemical structure of a complex terpene with isoprene units and linkages.

Chemical structure of a terpene with isoprene units and a ring structure.