Gp. Miller et al., FORMATION AND CHARACTERIZATION OF POLYSULTONATED C-60, Journal of the Chemical Society, Chemical Communications, (13), 1994, pp. 1549-1550
C-60 reacts with SO3, either neat or in fuming sulfuric acid (FSA), to
form a polysultone, C-60(SO3)(x); reaction in FSA yields a polysulton
e with average structure C-60(SO3)(5.2).