prov:value
| - ), (a material of the formula C???X???C), (a material of the formula W???C), (a material of the formula C???X???C), (a material of the formula C???X???C), (a material of the formula C???X???C) wherein R1 and R2 each, independently of the other, is an alkyl group with from 1 to about 18 carbon atoms, (a material of the formula C???X???C), (a material of the formula W???C) wherein R1 and R2 each, in
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