| 摘要 |
Compounds of formula (I) where: X1 is OH or SH or NH2 or-L-Z; X2 and X3 are the same or different and each is H, C1-4 alkyl, benzyl, a protecting group or -L-Z, X4 is H or C1-4 alkyl, L is a linker comprising a chain of 0 - 10 atom s, Z is a group comprising a detectable moiety which comprise at least one detectable moiety are useful in the diagnosis and prognosis and radiotherapy of metastatic bone disease.
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