| http://www.w3.org/ns/prov#value | - yl or alkyl moieties are optionally substituted with 1, 2 or 3 independently selected with substituents described herein, e.g., ???F, ???Cl, ???Br, ???I, ???OH, ???CH3, ???C2H5, ???O???CH3, ???O???C2H5, ???NO2, ???CN, ???SCN, ???NH2, ???C(O)ORPR or ???(CH2)1-4???C(O)???ORPR, where n is 0, 1, 2, 3, 4, 5 or 6, RPR is ???H or a protecting group such as methyl, ethyl, propyl or butyl, and M is a metal
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