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Design of proteasome active site probes; peptide-based probes for labeling of active proteasome subunits have been based on trileucine vinyl sulfones (A), the epoxyketone containing epoxomicin (B) and a belacostin A based derivative Dansyl-KF33955 (C). Abbreviations: Ahx: 6-aminohexanoyl, Ada: Adamantaneacetyl, Dansyl: 5-(dimethylamino)naphthalene-1-sulfonyl.
