prov:value
| - When R1 is substituted phenyl suitable substituents include nitro, trifluoromethyl, trimethylsilyl, bromo, chloro, fluoro, iodo, cyano, C1-6 alkyl such as methyl, ethyl, i-propyl, i-butyl, t-butyl and cyclopropyl, C2-6 alkenyl such as vinyl, C1-6 alkoxy such as methoxy, ethoxy and i-propoxy, phenoxy, amino, carboxamido and carbonylmethoxy.
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