prov:value
| - wherein R4 is an alkyl or alkylene group or an aryl or arylene group; R2 and R3, which can be the same or different, represent hydrogen, an alkyl group, an aryl group, ???OR5, ???NHR5, ???NR5R5, or ???SR5, wherein R5, which is the same or different, represents an alkyl group or an aryl group; and Q represents an aryl halide, an alkyl halide, an aryl alkyl halide, a benzyl halide, a haloalkyl ester
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