| http://www.w3.org/ns/prov#value | - c, cadmium, magnesium, aluminum, and copper; litharge or a combination of litharge with antimony trioxide and triphenyl phosphite as described in US. Patent No. 2,650,213; compounds of the formula wherein M is an alkali metal, e.g., lithium, sodium, or It is essential to exclude oxygen and moisture at all stages of the condensation reaction.
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