| http://www.w3.org/ns/prov#value | - tetramers, pentamers or hexamers thereof, and salts thereof such as alkali metal salts, for example lithium, sodium or potassium salts; monomers or oligomers of C2 to C20 amino acid amides such as 6-aminohexanamide or 11-aminoundecanamide, and dimers, trimers, tetramers, pentamers or hexamers thereof; esters, preferably C1-C4 alkyl esters, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-buty
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