prov:value
| - The radical G can be a hydrogen atom, acyl, such as C6 H5 C(O)--, alkyl, preferably lower alkyl, such as methyl, hydroxyethyl, hydroxypropyl, mercaptoethyl and aminoethyl, or aryl, such as phenyl, chlorophenyl, methoxyphenyl, nonylphenyl, hydroxyphenyl, and aminophenyl.
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