| 主权项 |
1. A compound of the Formula (A): or a salt thereof, wherein: X is C or N; Y is O or S; R1 is H, OH, J, OJ, SJ, or NJJ′, wherein J and J′ are each independently a one to ten carbon linear, branched, non-aromatic cyclic, or aromatic or partially aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein the optional substituent is selected from one or more of: oxo, COOH, COOR, CONH2, CONHR, CONR2, R, OH, OR, F, Cl, Br, I, NH2, NHR, NR2, CN, SH, SR, SO3H, SO3R, SO2R, OSO3R, and NO2, and wherein R is a linear, or branched saturated and unsubstituted C1-C10 alkyl; R2 is H, an amino acid side chain or a two to ten carbon linear, branched, or non-aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein the optional substituent is selected from one or more of: oxo, COOH, COOR, CONH2, CONHR, CONR2, R, OH, OR, F, Cl, Br, I, NH2, NHR, NR2, CN, SH, SR, SO3H, SO3R, SO2R, OSO3R, and NO2, and wherein R is a linear, or branched saturated and unsubstituted C1-C10 alkyl, provided that R2 is not a proline or phenylalanine side chain; R3 is H, OH, OG, SG, NGG′ or a one to ten carbon linear, branched, or non-aromatic cyclic, or aromatic or partially aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein G and G′ are each independently a one to ten carbon linear, branched, non-aromatic cyclic, or aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group and wherein the optional substituent is selected from one or more of: oxo, COOH, OH, COOR, CONH2, CONHR, CONR2, R, F, Cl, Br, I, NH2, CN, SH, SO3H, and NO2, wherein R is an unsubstituted C1-C10 alkyl; and R4 and R6 are each independently H, an amino acid side chain or a one to ten carbon linear, branched, aromatic or partially aromatic cyclic, or non-aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein the optional substituent is selected from one or more of: oxo, COOH, OH, OR, R, F, Cl, Br, I, NH2, NHR, NR2, CN, SH, SR, SO3H, SO3R, SO2R, OSO3R, and NO2, and wherein R is an unsubstituted C1-C10 alkyl, provided that both R4 and R6 are not H and provided that neither R4 or R6 are:andprovided that neither R4 or R6 is a proline side chain;
R5 is H, an amino acid side chain or a one to ten carbon linear, branched, or non-aromatic cyclic, saturated or unsaturated, optionally substituted alkyl group, wherein the optional substituent is selected from one or more of: oxo, COOH, CONH2, OH, F, Cl, Br, I, NH2, SO3H, and NO2, provided that R5 is not a proline or phenylalanine side chain; and is a double bond; and provided that the compound is not: |
