LETTERHEAD
\lˈɛtəhˌɛd], \lˈɛtəhˌɛd], \l_ˈɛ_t_ə_h_ˌɛ_d]\
Word of the day
Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.