- Negrusz A, Bowen A, Moore C, Dowd S, Strong M, Janicak P. Elimination of 7-aminoclonazepam in urine after a single dose of clonazepam. Anal Bioanal Chem. 2003;376:1198-204 pubmed..The range of concentrations detected was from 73.0 pg x mL(-1) to 183.2 ng x mL(-1). CLO was not detected in any of the samples. ..