OPAQUE GEM
\ə͡ʊpˈe͡ɪk d͡ʒˈɛm], \əʊpˈeɪk dʒˈɛm], \əʊ_p_ˈeɪ_k dʒ_ˈɛ_m]\
Word of the day
Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.