the different reactivities of the tested tetracyclines towards nitrite in acidic solutions ( ndma formation from minocycline , doxycycline , oxytetracycline and no ndma formation from tetracycline , chlorotetracycline and desmethylchlorotetracycline ) may be understood from stereochemical considerations .
C0039651
tetracyclines
C0030092
oxytetracycline