Patent ID: 7432276

Claim:
A compound having the structure of Formula I: wherein: R 1 and R 2 are independently optionally substituted lower alkyl; R 3 and R 4 are hydrogen; R 5 is hydrogen or optionally substituted lower alkoxy; R 6 is hydrogen or optionally substituted lower alkyl; R 7 and R 8 are hydrogen; R 20 is optionally substituted heteroaryl or —SR 14 in which R 14 is hydrogen, optionally substituted lower alkyl, optionally substituted aryl, optionally substituted heteroaryl, or optionally substituted heterocyclyl; A and D are independently 5 or 6 membered monocyclic heterocyclic, monocyclic heteroaryl, or monocyclic aryl rings; and X is oxygen, sulfur, —S(O)—, —S(O) 2 — or —NR 16 —, in which R 16 is hydrogen, optionally substituted lower alkyl, optionally substituted aryl, —C(O)R 12 , or —S(O) 2 R 13 , in which R 12 is optionally substituted lower alkyl, lower alkoxy or —NR 14 R 15 , in which R 13 , R 14 , and R 15 are independently hydrogen, optionally substituted lower alkyl, optionally substituted aryl, optionally substituted heteroaryl, or optionally substituted heterocyclyl, or R 14 and R 15 may join to form a 5 or 6 membered optionally substituted heterocyclic ring.