Patent ID: 8722656

Claim:
A compound of formula I or a pharmaceutically acceptable salt thereof wherein: R 1 is —NR 4 R 5 , —SO 2 R 6 , —C(═O)NR 4 R 4 , —SR 4 , —S(C═O)R 4 , —C 1-4 alkyl substituted with —SR 4 , —S(C═O)R 4 , —(═O)NR 4 R 5 , or —SO 2 R 6 ; or R 1 is —OC 1-8 alkyl substituted with —SR 4 , —S(C═OR 4 , —C(═O)NR 4 R 5 , or —SO 2 R 6 ; R 2 and R 3 are independently —H, —OH, —CN, halo, —NO 2 , —C 1-10 alkyl, —OC 1-10 alkyl, —N(R 4 ) 2 ; R 4 is —H or —C 1-10 alkyl; R 5 is —SO 2 R 4 ′, —C(═)C 1-10 alkyl; R 6 is H, C 1-6 alkyl, or NR 4 R 4 ; at each occurrence, C 1-10 alkyl is optionally substituted with —OH, —CN, halo, —NO 2 , —OC 1-6 alkyl, —SH, —SC 1-4 alkyl, —S(C═O)C 1-4 alkyl, or —O(C═O)C 1-4 alkyl; and n is 1, 2, or 3.