prov:value
| - erein at least one of R1, R2, R3, R4, R5, and R6 is other than hydrogen; wherein R1, R2, R3, and R4 are independently selected from the group consisting of hydrogen, alkanoyl having 2 to 6 carbons, hydroxy-substituted alkanoyl having 2 to 6 carbons, and acyloxy-substituted alkanoyl having 2 to 6 carbons, and wherein at least one of R1, R2, R3, and R4 is other than hydrogen.
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