Anhydrotetracycline hydrochloride inhibits Tet(50) (IC 50 =210 μM),Tet(X) (IC 50 =41 μM), Tet(X)_3 (IC 50 =3 μM) degradations of tetracyclines. Anhydrotetracycline hydrochloride inhibits Tet(50) (IC 50 =210 μM),Tet(X) (IC 50 =75 μM), Tet(X)_3 (IC 50 =26 μM) degradations of chlortetracycline. Anhydrotetracycline hydrochloride inhibits Tet(50) (IC 50 =120 μM),Tet(X) (IC 50 =41 μM), Tet(X)_3 (IC 50 =7 μM) degradations of demeclocycline. Anhydrotetracycline hydrochloride inhibits Tet(50) (IC 50 =210 μM),Tet(X) (IC 50 =41 μM), Tet(X)_3 (IC 50 =3 μM) degradations of tetracyclines. Anhydrotetracycline hydrochloride inhibits Tet(50) (IC 50 =210 μM),Tet(X) (IC 50 =75 μM), Tet(X)_3 (IC 50 =26 μM) degradations of chlortetracycline. Anhydrotetracycline hydrochloride inhibits Tet(50) (IC 50 =120 μM),Tet(X) (IC 50 =41 μM), Tet(X)_3 (IC 50 =7 μM) degradations of demeclocycline.