1 consequence of its antibiotic activity against a variety of bacteria and fungi. 2 Subsequently, it was reported that adehydrobiotin is accompanied by two other biotin antagonist~~ and that it is a product of the catabolism of bi~ tin.~ We undertook synthesis of this biologically interesting molecule since we had available experience and intermediates derivingfrom the synthesis of biotin it~ elf.~ The approach we followed was to divert the ...