| http://www.w3.org/ns/prov#value | - ogen, oxygen or sulfur atom, Y is a carbon or sulfur atom, Z is a nitrogen, oxygen or sulfur atom, and X2 is a nitrogen, oxygen or sulfur atom), and (g) a halogen compound having, in the molecule, a bond represented by the general formula, ##STR2## (wherein Y1 is a nitrogen or oxygen atom and X is a halogen atom).
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