PREEMPTION CLAUSE
\pɹiːˈɛmpʃən klˈɔːz], \pɹiːˈɛmpʃən klˈɔːz], \p_ɹ_iː__ˈɛ_m_p_ʃ_ə_n k_l_ˈɔː_z]\
Word of the day
Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.