prov:value
| - ur atom; R2, R3, R3', R3, R4, R4', R4, and R5 can be the same or different and are a hydrogen atom, a linear or branched C1-C20 hydrocarbyl radical, a linear or branched C1-C20 halocarbyl radical, a linear or branched C1-C20 hydrohalocarbyl radicals, a linear or branched C1-C20 alkoxy radical, a C3-C12 cyclohydrocarbyl radical, a C3-C12 cyclohydrohalocarbyl radical, an aryl radical, an alkylaryl
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