OBDURATENESS
\ˈɒbdjʊ͡əɹətnəs], \ˈɒbdjʊəɹətnəs], \ˈɒ_b_d_j_ʊə_ɹ_ə_t_n_ə_s]\
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Word of the day
Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.