| http://www.w3.org/ns/prov#value | - alkyl, polyfluoroalkyl (such as 1,1,1-trifluoroethyl), alkenyl, aryl or heteroaryl (preferably substituted with one of the preferred R1 substituents above), or PO(OAlkyl)2.If R2 is alkyl, 1,1,1-trifluoroethyl, or alkenyl, it is preferred that R1 is other than alkyl or alkenyl.It is preferred that L1 contains 1 to 5 atoms in the linear chain and L2 is a bond or lower alkylene.Preferred embodiments
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