摘要 |
<p>This invention is related to a compound with the structural formula (I). Wherein, R1, and R2 are independently selected from the group consisting of C1-C6 alkyl and is preferably methyl, ethyl, propyl or isopropyl; R3 is selected from the group consisting of CH2NHR9, C(=0)YR10, -CH20H; Formula (II).</p> |