Hello, everyone，

Recently, we found an intermolecular disulfide bond from different symmetric units. I want to define it to refine, such as by refmac5.  I know the regular format of a disulfide bond in the same symmetric unit and show it as below.

 SSBOND   1 CYS A  115    CYS A  191

My question is： How to define a disulfide bond from different symmetric units?

Best,