PAINSTAKER

\pˈe͡ɪnste͡ɪkə], \pˈe‍ɪnste‍ɪkə], \p_ˈeɪ_n_s_t_eɪ_k_ə]\
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1899 - The american dictionary of the english language.
By Daniel Lyons
 
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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