| http://www.w3.org/ns/prov#value | - Synthesizing method (3): A compound of the formula (15), in which R1???H, R4???H and at least one of R2 and R3 is an organic structure having 0 to 20 carbon atoms other than hydrogen, can be synthesized by reacting a sulfur-containing diepisulfide compound of the formula (19) with one or two kinds of thiol compounds of the above formula (20) in the presence of a base to obtain a reaction product a
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