| http://www.w3.org/ns/prov#value | - In the general formulae (17) and (18), R is a hydrocarbon group, X is a halogen atom and the symbols a, b, c and d represent each a number sufficing the conditions 0???a???3, 0???b???3, 2???a+b???3, 0???c???4, 0???d ???4 and 3???c+d???4, respectively.
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