prov:value
| - alkanoyl is preferred), S-alkyl groups of from 1 to about 20 carbon atoms such as benzyl, t-butyl, trityl, 4-methoxybenzyl and 2,4-dimethoxybenzyl (wherein 2,4-dimethoxybenzyl is preferred), alkoxyalkyl groups of from 1 to about 10 carbon atoms such as methoxymethyl, ethoxyethyl and tetrahydropyranyl (wherein tetrahydropyranyl is preferred), carbamoyl, and alkoxy carbonyl groups of from 1 to abou
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