CRINOIDEA
\kɹˈɪnɔ͡ɪdˌi͡ə], \kɹˈɪnɔɪdˌiə], \k_ɹ_ˈɪ_n_ɔɪ_d_ˌiə]\
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Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.