prov:value
| - ilyl group, provided that at least one of Y1 and Y2 is one of said ???OR???, ???SR???, ???NR???, ???C(H)???, ???C(R???)???, or ???PR???2 radicals; Z is a bivalent atom or group having at least one chain atom which is one of a carbon, silicon, oxygen, sulphur, nitrogen, or phosphorus atom; each Rv is the same or different and is one of a hydrogen atom, a halogen atom, a C1-C10 hydrocarbyl group, or
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