| http://www.w3.org/ns/prov#value | - An x-ray contrast medium comprising a physiologically tolerable multinuclear complex of formula M6 (??3 B)8, where each M which may be the same or different is a W or Mo atom, each B which may be the same or different is a bridging O, S, Se, Te, Cl, Br, or I atom covalently bonded to at least two metal atoms M and optionally to further atoms, and wherein at least one B is a Cl, Br, or I atom; or a
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