prov:value
| - l, nitro, amino, amido, azido, oxime, cyano, thiol, alkoxy (ether) and thio ether radicals; one of R1 and R2 is ???O, --OH or a --O(CO)R6 group, and the other one is --OH or --O(CO)R6, or R1 is ???O and R2 is H; R3 is ???O, OH or O(CO)R6 ; wherein R6 is a saturated or unsaturated acyclic hydrocarbon group having from 1 to ab6ut 20 carbon atoms, or --(CH2)m R7 wherein m is 0-10, and R7 is an alipha
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