| abstract |
There is provided herein compounds of formula I, wherein R 1 is H or linear or branched C 1 -C 6 lower alkyl; R 2 is H, linear or branched C 1 -C 6 lower alkyl, or a proteinogenic amino acid side chain; R 3 is H, linear or branched C 1 -C 6 lower alkyl, or a proteinogenic amino acid side chain; R 4 is -OH or -O-R 5 wherein R 5 is linear or branched C 1 -C 6 lower alkyl; and each R 6 is independently H or -CH 3 ; or a pharmaceutically acceptable prodrug, salt, or ester thereof. Compositions containing said compounds, and uses thereof, are also provided. (I) |