| http://www.w3.org/ns/prov#value | - H2 N--.O slashed.--S--.O slashed.--NH2 (i.e., thiodianiline), or ##STR34## wherein R* and R' are aromatic radicals, at least one of R* and R' being a diaryl radical wherein the aryl rings are joined by a "sulfone linkage (L), and t is an integer from 0 to 27 inclusive.
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