S METHYLMETHIONINE
\ˈɛs mˈiːθɪlmˌɛθɪˌɒna͡ɪn], \ˈɛs mˈiːθɪlmˌɛθɪˌɒnaɪn], \ˈɛ_s m_ˈiː_θ_ɪ_l_m_ˌɛ_θ_ɪ__ˌɒ_n_aɪ_n]\
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Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.