| http://www.w3.org/ns/prov#value | - The compound of claim 1, wherein each substituent on X3 and X4 other than the bridging group independently is a hydrogen atom, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, or a decyl group.
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