| prov:value
| - dene, lower alkenylene having up to and including 4 carbon atoms, such as 1,3-propen-2-ylene, lower alkenylidene having up to and including 7 carbon atoms, such as 1,1-buten-3-ylidene, 3- to 8-membered cycloalkylene, such as cyclopropylene, 3- to 8-membered cycloalkylidene, such as cyclopentylidene, or cycloalkyl-lower alkylidene having up to and including 7 carbon atoms in the alkylidene moiety a
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