| 主权项 |
1. A compound of formula I′: wherein Each X is independently S or O; Each Y is independently H or Me; Each R is independently alkyl optionally substituted with OH, OMe, SH, SMe, optionally substituted phenyl, NH2, NH-alkyl, or N(alkyl)(alkyl); or each R is independently the side chain of a naturally-occurring or non-natural amino acid (including, e.g., phenylalanine, tyrosine, tryptophan, histidine, serine, methionine, and the like); or wherein each Y and R and the adjacent atoms attached to them (nitrogen and carbon, respectively) can combine to form a heterocyclic ring; Each R2 is independently H, alkyl, or —C(O)alkyl. |
