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Thank you all for your fast help,in summary, don't use SSBOND but the LINK command and specify which conformer makes the SS-bond.
Juergen -- Jürgen Bosch Howard Hughes Medical Institute and University of Washington Dept. of Biochemistry, K-426 1705 NE Pacific Street Seattle, WA 98195 Box 357742 Phone: +1-206-616-4510 FAX: +1-206-685-7002