prov:value
| - The article of claim 1, wherein in said structure either all of R1, R3, R4, R5, R6, R8, R9, and R10 are H, and at least one of R2 and R7 is an alkyl group; or all of R2, R3, R4, R5, R7, R8, R9, and R10 are H, and at least one of R1 and R6 are CH3. 11.
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