Patent ID: 8575176

Claim:
A compound represented by the formula III: and pharmaceutically acceptable salts thereof, wherein: A 2 is represented by the formula: wherein one Q is a nitrogen atom, five Q are carbon atoms and one Q is C—R 5 ; R 5 is —O—CH 2 —(CHOH)—CH 2 OH, —OH, —O—(CH 2 ) 3 NH 2 , —O—(CH 2 ) 3 NH(C═NH)NH 2 , —O—(CH 2 ) 2 NH(C═NH)NH 2 , —O—CH 2 (CO)NH 2 , —O—(CH 2 ) 2 —N ⊕ —(CH 3 ) 3 ,