| http://www.w3.org/ns/prov#value | - In a specific embodiment, the optional polycarbonate comprises 1 to 20 mole percent of units of formula (7a), specifically units of formula (7a) wherein each R2 is methyl, each R3 is derived from eugenol, and the same or different divalent C1-10 organic group, and E is an integer having an average value from 4 to 100.
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