prov:value
| - one group selected from vinyl, propyl, butyl, amino, imino, epoxy, methacryloxy, glycidoxy, phenyl and SH group, R2 is hydrogen, a hydrocarbon group having from one to six carbon atoms or a vinyl group, R3 is a hydrocarbon group having from one to five carbon atoms, an alkoxyalkyl group having from one to five carbon atoms or an acyl group having from one to four carbon atoms, a is an integer 0, 1
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