| http://www.w3.org/ns/prov#value | - RmMgR???n where R and R??? are the same or different C2-C12 alkyl groups, preferably C4-C10 alkyl groups, more preferably C4-C8 alkyl groups, and most preferably both R and R??? are mostly butyl groups, and m and n are each 0, 1 or 2, providing that m +n is equal to the valence of Mg.
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