| http://www.w3.org/ns/prov#value | - MR1 xR2 yAz where M is an element selected from the group consisting of Li, Na, K, Rb, Cs, Fr, Be, Mg, Ti, Zr, Hf, Sc, Y, La, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, B, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, P, Sb and Bi; R1 and R2 are the same or different ligands selected from the group consisting of hydride, alkyl, alkenyl, cycloalkenyl, aryl, alky
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