prov:value
| - The symbol R1 in formulae I, Ia, Ib, II, III, IV and V above preferably signifies hydrogen or straight-chain C1 -C10 -alkyl, especially hydrogen or straight-chain C1 -C5 -alkyl, when m stands for the number 0, and preferably signifies hydrogen or straight-chain C1 -C8 -alkyl, especially hydrogen or straight-chain C1 -C3 -alkyl, when m stands for the number 2.
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