prov:value
| - An aliphatic radical R1 or R2 is, for example, lower alkyl, e.g. methyl, ethyl, n- or i-propyl, n-, i- or sec. butyl, n or i-pentyl, neopentyl, n-hexyl or n-heptyl; lower alkenyl, e.g. allyl, methallyl or 2-butenyl; lower alkynyl, e.g. propargyl; mono- or bicyclic cycloalkyl, cycloalkenyl, cycloalkyl-lower alkyl or cycloalkenyl-lower alkyl with preferably 3 to 7 ring-carbon atoms, 1 to 4 chain car
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