prov:value
| - or by reaction of the secondary amine with an alpha-thiocyanatoketone according to the reactions schemes (b) ##STR8## in which W, R3, Z1, Z2, Ar1 and Ar2 are as defined in formula I, with the exception of halogeno for R3, or W, Ar1, Ar2 represent equivalent groups in which the reactive functions have been protected in a standard manner and X is halogen, in particular chlorine or bromine, and prefe
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