Patent ID: 7326713

Claim:
A compound having the following structure: or a stereoisomer, or pharmaceutically acceptable salt thereof, wherein: X is NH, S or O; Z is CH or N, with the proviso when X═NH then Z═CH; R 1 and R 2 are the same or different and are independently hydrogen, hydroxyl, halo, —CN, —NO 2 , —NH 2 , —R, —OR, —SCH 3 , —CF 3 , —C(═O)OR or OC(═O)R, where R is alkyl or substituted alkyl; R 3 is hydrogen, —NH 2 , alkyl, —CN, or —NO 2 , L 2 is selected from —NHCH 2 —, —NH—, —C(═S)NH—, —NHC(═S)—, —C(═S)NHCH 2 —, —NHC(═S)NH—, —NHC(═O)—, —NHC(═O)NH—; —S(═O) 2 —; and Cycl 2 is