| http://www.w3.org/ns/prov#value | - 2,2-bis(tert-butylperoxy)butane, dicumyl peroxide or tert-butyl hydroperoxide; and azo compounds such as 2,2???-azobis[N-(2-propenyl)-2-methylpropionamides], 1-[(cyano-1-methylethyl)azo]formamides, 2,2???-azobis(N-butyl-2-methylpropionamides), 2,2???-azobis(N-cyclohexyl-2-methylpropionamides), 2,2???-azobis{2-methyl-N-[2-(1-hydroxybutyl)]propionamides}, 2,2???-azobis {2-methyl-N-[2-(1-hydroxybutyl
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