| 摘要 |
PCT No. PCT/AU86/00392 Sec. 371 Date Dec. 21, 1987 Sec. 102(e) Date Dec. 21, 1987 PCT Filed Dec. 22, 1986 PCT Pub. No. WO87/04154 PCT Pub. Date Jul. 16, 1987.A compound of formula I <IMAGE> Formula I wherein R1 is of formula II <IMAGE> Formula II wherein R4 and R5, which may be the same or different, are bromo, chloro, iodo or alkylsulphonyl; R2 is of formula III <IMAGE> Formula III wherein R6 and R7, which may be the same or different, are H, alkyl, aryl, carboxy, hydroxy or amino and n is 0-10; and R3 is hydroxy or a group capable of being cleared and replaced by a radical having an antigen binding site or R3 is a radical having an antigen binding site.
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