Patent ID: 8796275

Claim:
A compound of Formula I: wherein: X is N(R 9 ), O, S, S(═O), or S(═O) 2 ; R 9 is H or C 1 -C 8 alkyl; R 1 and R 2 are H; R 3 and R 4 are, independently, wherein each W, Y, and Z are, independently, C or N; each R 5 is, independently, H or C 1 -C 8 alkoxy; and each R 6 is, independently, the free base or salt form of —(CH 2 ) n —NH 2 , or —(CH 2 ) n —NH—(CH 2 ) n —NH 2 , or —(CH 2 ) n —NH—C(═NH)NH 2 , where each n is, independently, 1 to 8; or a pharmaceutically acceptable salt thereof.