| http://www.w3.org/ns/prov#value | - R in the formulae [I] and [IV] is an amino group which may have one or more substituents, a hydroxyl group, a formyl group, a carboxyl group, a sulfonic acid group, an acetal group, a halogen atom such as fluorine, chlorine, bromine, or iodine, or a group of the formula: ##STR18## wherein R' is a hydrogen atom or an alkyl group such as methyl, ethyl, propyl, butyl, etc.
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