I dont see any structural similarities between these and clonazepam or its metabolite 7-aminoclonazepam, the only thing I can think of is the chlorine atom in halodrol but thats faaaaar fetched. You sure you didnt get roofied? Clonazepam has a looooong half life, you could have had a dose days prior to your test and still test positive, especially if you have high bf %.