| http://www.w3.org/ns/prov#value | - rholder atom X, wherein dimerholder atom X comprises a Group III element, a Group IV element other than carbon, or a Group V element, to form a tip end of the tooltip molecule; and a capped carbon dimer covalently bonded to the dimerholder atom X wherein the capped carbon dimer has a structure ???C-cap or ???C-cap-C???.
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