prov:value
| - When d is 2 or larger, R.sub.5 may be the same or different and moreover, R.sub.5 may bond with each other to form a ring.Specific examples of R.sub.5 include halogen atoms such as a fluorine atom, chlorine atom, bromine atom, and iodine atom; hydrocarbon groups such as a methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group,isobutyl group, t-butyl group, n-pen
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