prov:value
| - The term alkylene used in this specification for R1 and R3 denotes straight and branched chain divalent alkylene radicals and the conventionally positioned isomers thereof having 1 to 10 carbon atoms inclusive, such as methylene; and 1,2-ethylene; and 1,3-propylene; 1,1-propylene; 1,4-butylene; 1,5-pentylene; 2,5-hexylene; 1,6-hexylene; 1,7-heptylene; 2-methyl-1,7-heptylene; 1,8-octylene; 3-isop
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