| http://www.w3.org/ns/prov#value | - -amine), alkali metals, such as sodium or potassium, alkali metal amides, alkali metal hydrides, alkaline earth metal amides and alkaline earth metal hydrides, such as sodium amide, sodium hydride and calcium hydride, and, moreover, also alkali metal alcoholates, such as sodium methylate, sodium ethylate and potassium tert-butylate.
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