| http://www.w3.org/ns/prov#value | - (5) each of R1-R4 is independently selected from the group consisting of methyl, ethyl, propyl, isopropyl, a siloxane chain, and phenyl, wherein the phenyl may optionally be substituted by 1-3 members from the group consisting of methyl and ethyl (with more particular values for R1-R4 being selected from methyl and ethyl and especially methyl);
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