| http://www.w3.org/ns/prov#value | - Conveniently, Q??? in formula (3) is present and is a bridging group containing at least one Group 13, 14, 15, or 16 element, in particular boron or a Group 14, 15 or 16 element, and Q??? in formula (3) can be bonded to any propoxyheneicosyl, propoxydocosyl, propoxytricosyl, propoxytetracosyl, propoxypentacosyl, propoxyhexacosyl, propoxyheptacosyl, propoxyoctacosyl, propoxynonacosyl, propoxytriaco
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