| http://www.w3.org/ns/prov#value | - The substituent of the optionally substituted phenyl group in the definition of R27 in the formula [21] may be, for instance, a halogen atom such as chlorine atom, bromine atom, iodine atom or fluorine atom, an alkyl group such as methyl, ethyl, tert-butyl, etc., or an alkoxy group such as methoxy, ethoxy, etc.
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