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Hello, everyone，<o:p></o:p> 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.<o:p></o:p> SSBOND 1 CYS A 115 CYS A 191<o:p></o:p> My question is： How to define a disulfide bond from different symmetric units?<o:p></o:p> Best,<o:p></o:p>zhongzhou chen