5HY9:
reference: Structural differences between glycosylated, disulfide-linked heterodimeric Knob-into-Hole Fc fragment and its homodimeric Knob-Knob and Hole-Hole side products., Kuglstatter A, Stihle M, Neumann C, Muller C, Schaefer W, Klein C, Benz J, Protein Eng Des Sel. 2017 Sep 1;30(9):649-656. doi: 10.1093/protein/gzx041. PMID: 28985438

This OCA Structure page
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