mcilvain 's solution ( mcbuffer ) was used previously to extract oxytetracycline ( otc ) , tetracycline-hcl ( tc-hcl ) , and chlortetracycline-hcl ( ctc-hcl ) from animal feed because it gave the best recoveries for all 3 tetracyclines ;
C0546879
tetracycline-hcl
C0039651
tetracyclines