prov:value
| - wherein R1, R2, R3, R4, and R5 are independently selected from the group consisting of hydrogen and C2-C12 acyl groups, wherein at least one of R1, R2, R3, R4, and R5 is a C2-C12 acyl group; and X is formyl, hydroxymethylene, aminomethyl, R6???NH???CH2??? or carboxy or a mixture thereof, wherein R6 is selected from the group consisting of alkyl, aryl, or alkylene-aryl, provided when at least some
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