| http://www.w3.org/ns/prov#value | - (6) carboxylic acid metal salts of the formula R17 lM???(OCOR18)4-l, R19 lM???(OCO???R20???COOR21)4-l or the following formula (wherein R17 to R23 are each independently a hydrocarbon group of 1 to 20 carbons, M??? is a tin atom, a silicon atom or a germanium atom; and l is an integer from 0 to 3).
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