prov:value
| - In the above-described Formula 5, the divalent metal atom (M2) may be exemplified by, for example, alkaline earth metals such as beryllium, magnesium, calcium, strontium and ballium, etc., transition metals such as molybdenum, tungsten, manganese, iron, ruthenium, osmium, cobalt, rhodium, iridium, nickel, palladium, platinum, copper, silver, etc., and typical metals such as zinc, cadmium, mercury,
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