prov:value
| - R8 is hydrogen, alkyl, or aryl; L1is an oxy, ???C(Ra)2???, or ???NRa??? where Ra is hydrogen, alkyl, or aryl; Y3 is a divalent group selected from an alkylene, heteroalkylene, arylene, carbonyl, carbonyloxy, carbonylimino, oxy, thio, ???NRa???, or combinations thereof, wherein Ra is hydrogen, alkyl, or aryl; R1 and R2 together with a dicarboximide group to which they are attached form a four to ei
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