| http://www.w3.org/ns/prov#value | - la wherein R1 and R2 are each, independently of the others, alkyl groups, preferably with 1 or 2 carbon atoms, aryl groups, preferably with from 6 to about 9 carbon atoms, or alkylaryl groups, preferably with from 7 to about 9 carbon atoms, such as benzoyl peroxide, pivaloyl peroxide, and the like, peroxycarbonates, such as sodium percarbonate and the like, and the like, as well as mixtures thereo
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