prov:value
| - carbylene, oxygen, sulfur, or sulfonyl, and Ar3 has one of the formulae: ##STR17## wherein R3 is a hydrogen, unsubstituted hydrocarbyl, substituted hydrocarbyl, wherein the substituent(s) is an inert monovalent moiety, halo or cyano moiety, and Y is a covalent bond, hydrocarbylene, oxygen, sulfur, sulfonyl or carbonyl linkage.
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