OBDURATENESS

\ˈɒbdjʊ͡əɹətnəs], \ˈɒbdjʊ‍əɹətnəs], \ˈɒ_b_d_j_ʊə_ɹ_ə_t_n_ə_s]\
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1871 - The Cabinet Dictionary of the English Language

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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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