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Figure 1
The molecular fractionation with conjugate caps (MFCC) procedure for cutting a dipeptide (left) across the peptide bond (shown in black), producing two fragment molecules (right), which are then `capped' with –CH3C=O (red) and –NHCH3 (orange) groups, comprised of the neighbour and next-neighbour non-H atoms.

IUCrJ
Volume 7| Part 2| March 2020| Pages 158-165
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519015975