New sulfide-bridged heterocubanes MVI(S)ReI3(CO)9(m3-S)4-, M = Mo or W, with transition metals in very different oxidation states. Chemical Communications (Cambridge, United Kingdom), 18:2055--2056, 1998. [PUMA: carbonyl charge heterocubane heterocubane;crystal heterocubane;cubane heterocubane;rhenium heterocubane;tungsten molybdenum potential prepn prepn;molybdenum prepn;redn prepn;structure rhenium structure sulfido sulfidorhenium transfer tungsten]