| http://www.w3.org/ns/prov#value | - R2, R3, and R4, are the same or different at each occurrence and are hydrogen, alkyl such as methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, t-butyl, neopentyl, and the like: phenyl: phenylalkyl, such as benzyl, phenethyl, and the like; phenyl substituted with one or more alkyl or alkoxy groups, such as tolyl, xylyl, p-methoxyphenyl, m-ethoxyphenyl, p-propoxyphenyl, 1-methoxy 4-methyl phen
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