| http://www.w3.org/ns/prov#value | - , Q is phenyl or (lower)alkyl, R is an easily removable ester protecting group, X is 1 or 2 and M is Cu(II), Pb(II) or Hg(II) when x is 2 or Ag(I) when xis 1;(B) ##STR55## in which Y, Q and R are as defined above under (A); and(C) ##STR56## wherein Y is as defined above in regard to compounds of formula I, Q is phenyl or (lower)alkyl, R is an easily removable ester protecting group and T is ##S
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