prov:value
| - und of structure 1 in which R4 is a lower alkyl or aralkyl group, unbranched on the carbon next to oxygen, for example, the methyl, ethyl, n-propyl, n-butyl, benzyl groups, and the like, by treatment with alkali metal hydroxide solution, or (c) for the preparation of a compound of structure 1 in which R4 is hydrogen from a compound of structure 1 in which R4 represents a moiety that can be removed
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