| http://www.w3.org/ns/prov#value | - An x-ray contrast medium comprising a physiologically tolerable multinuclear complex of formula I (M6 (μ3 B)8 Av)x Lw where each M which may be the same or different is a Mo, W, Re, Tc, V, Nb, Ta, Ru, or Fe atom; each B which may be the same or different is a non-metal bridging atom covalently bonded to at least two metal atoms M and optionally to further atoms; each A which may be the same o
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