| 摘要 |
A compound having the structure: bond a is present or absent, wherein when bond a is absent, then R1 is =0 or S(CH2)1-3-phenyl and when bond a is present, then R1 is H, wherein the phenyl is substituted or unsubstituted; R2, R3, R4, R5, R6, R7, R8, R9 and R10 are independently H or OR11 wherein each occurrence of R11 is independently H, methyl, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, phosphate, sulfate, sulfonic ester, or ester; when a is absent and R1 is =0, then R10 is other than OH; and when a is absent and R1 is S(CH2)1-3-phenyl, then R10 is other thanOCH3, or a salt thereof. |
