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The reaction of 1 with the two disulfides 10a and 10e led to the known products 6a, 6e and to the unsymmetrically substituted BCP 16 as the main product. The compounds could be separated by column chromatography and preparative TLC. The structure of 16 could be confirmed by single-crystal X-ray diffraction (displacement parameters are drawn at 50% probability level).
