[fuzzfactor]

Plain cyclopentadiene is way stronger smelling than any of those.

Also dicyclopentadiene which is a higher-"boiling" dimer which often serves as a source of cyclopentadiene by thermal breakdown. The DCPD solidifies at lower room temperatures. It also spontaneously decomposes to an extent so what you are smelling is probably the CPD anyway.

General agreement technically is that DCPD is some nasty-smelling shit, one drop on your foot and the shoes are staying outside for the night :\

Interestingly, in very low concentrations it is used in some fragrances as a once-secret ingredient.