THROTTLE-VALVE
\θɹˈɒtə͡lvˈalv], \θɹˈɒtəlvˈalv], \θ_ɹ_ˈɒ_t_əl_v_ˈa_l_v]\
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Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.