PREEXISTENT

\pɹˈiːksɪstənt], \pɹˈiːksɪstənt], \p_ɹ_ˈiː_k_s_ɪ_s_t_ə_n_t]\
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2011 - English Dictionary Database
By DataStellar Co., Ltd
 
2006 - WordNet 3.0
By Princeton University

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Quinones

  • Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.
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