| http://www.w3.org/ns/prov#value | - In additional to carbon, hydrogen, and oxygen, a carboxylic acid may include heteroatoms, such as S, N, P, B, Si, F, Cl, Br, and I. In some embodiments, a suitable ester compound is an ester of oxalic, malonic, succinic, malic, tartaric, citrate, phthalic, ethylenediaminetetraacetic (EDTA), nitrilotriacetic, phosphoric acids, etc.
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