| http://www.w3.org/ns/prov#value | - Among them, examples of a particularly suitable material include gallic acid; gallate such as methyl gallate, ethyl gallate, n-propyl gallate, i-propyl gallate, and butyl gallate; dihydroxybenzoic acid and its ester such as 2,3-dihydroxybenzoic acid, and methyl 3,5-dihydroxybenzoate; hydroxyacetophenones such as 2,4-dihydroxyacetophenone, 2,5-dihydroxyacetophenone, 2,6-dihydroxyacetophenone, 3,5-d
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