| http://www.w3.org/ns/prov#value | - Suitable multi-functional compounds of formula M(TH)x(G)y include amino acids such as glycine, alanine, lysine, leucine, isoleucine, phenylalanine, tyrosine, proline, aspartic acid, glutamic acid, taurine, 2-aminoethylphosphonic acid, glutamine, and the like; and hydroxy acids such as hydroxyethanesulfonic acid, 3-hydroxypropionic acid, 6-hydroxyhexanoic acid, glyceric acid, glycolic acid, N-phosp
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