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. 2020 Nov 28;25(23):5601. doi: 10.3390/molecules25235601

Figure 1.

Figure 1

Representative examples of a peptidyl chloromethyl ketone (1) [12], peptidyl fluoromethyl ketones (2 [3] and 3 [2]), and a peptidyl tri-fluoromethyl ketone (4) [15].