prov:value
| - Preferably, at least one Y is a halogen or R1 wherein R1 is an organic group, and more preferably, every Y is R1 wherein R1 is hydrogen or an organic group. [0038] In the Y groups of Formula II, each R1, R2, and R3 is independently hydrogen or an organic group optionally containing one or more heteroatoms (e.g., oxygen or nitrogen), fluorine atoms, or functional groups (e.g., a carbonyl group, a h
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