Patent ID: 8067425

Claim:
A compound having the formula: or a pharmaceutically acceptable salt or thereof, where X 1 is NH; X 2 is CH 2 ; R 1 is allyl, R 2 , and R 3 are independently selected from the group consisting of —H, —OR′, —SR′, —NR′R′, —NO 2 , —CN, —C(O)OR′, —C(O)NR′R′, —C(NR′)NR′R′, trihalomethyl, halogen, alkyl, heteroalkyl, alkenyl, alkynyl, aryl, heteroaryl, arylalkyl, and heteroarylalkyl; each R′ is independently selected from the group consisting of —H, alkyl, heteroalkyl, alkenyl, alkynyl, aryl, arylalkyl, heteroaryl and heteroarylalkyl; R 4 and R 5 are H; and optionally, wherein R 2 and R 3 taken together are —CH 2 —(CH 2 ) n —CH 2 — where n is an integer from 0-6.