prov:value
| - Ra is hydrogen, is C1 -C4 -alkyl as stated above, in particular methyl, is C3 -C6 -alkenyl as stated above, in particular 2-propenyl, 2-butenyl, or is C3 -C6 -alkynyl as stated above, in particular 2-propynyl, 2-butynyl Rb is hydrogen, is C1 -C4 -alkyl as stated above, in particular methyl, is C3 -C6 -alkenyl as stated above, in particular 2-propenyl, 2-butenyl, or is C3 -C6 -alkynyl as stated abo
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