Patent ID: 7176236

Claim:
A compound of Formula IIb: wherein: X is a linking group selected from the group consisting of —O—, —S—, —NH—, —CO—, —CH═N—, or CH 2 NH—, and in one preferred embodiment is —NH—; R 1 is a covalent linkage between X and Z, or is loweralkyl, loweralkenyl, or phenyl, and when phenyl is unsubstituted or is substituted from one to four times with loweralkyl, hydroxy, alkoxyl, alkylogen, alkylamino, alkyoxycarbonyl, amino, halogen, nitro, or nitrile; Y is none, —NHCO—, —CONH—, —OCO—, or —COO—; Z is —(CH 2 ) n R 3 , where n is 0 to 8, or —(CH 2 ) n — is incorporated into Z as a five-, six-, seven-, or eight-membered ring, R 3 is a loweralkyl, loweralkenyl, aryl, lower alkylamino, lower alkenylamino, or arylamino; R 12 —OR 4 , —NR 4 R 5 , —OCOR 4 , —OCOOR 4 , —OCOSR 4 , or —OCONR 4 R 5 , where R 4 and R 5 are selected from the group consisting of lower alkylamino, lower alkenylamino, and arylamino; or a pharmaceutically acceptable salt thereof.