@Brian_BH Could you share rationale for 404109?
QID: 404109:
Question requires specific understanding of what constitutes a peptide bond, including that it is a bond between a carbon and nitrogen, as well as it having partial double-bond character that restricts rotational motion around said bond, in order to discriminate from other, similar, bonding structures illustrated that also involve C-N bonds but are either not resonance stabilized, or are not between carbon and nitrogen, specifically, as discriminators.