Patent ID: 6987193

Claim:
A compound of the formula: wherein R1 is (CH2) n —Y, where n is 0 to 4; Y is CHO, NH 2 , COOH, —(C 2 -C 4 )alkenyl-CHO, —CH(O(C 1 -C 4 )alkyl) 2 , cyclo(C 3 -C 6 )alkyl or 5-membered heteroaryl comprising one or more heteroatoms selected from N, S, or non-peroxide O, where the cycloalkyl or heteroaryl is optionally substituted with 1-2 (C 1 -C 4 )alkyl, CHO, OH or halo R 3 is H or (C 1 -C 4 )alkyl; R 4 is SCH 2 CO 2 (C 1 -C 4 )alkyl, or H; R 5 is H, OH or absent; R 6 is (C 1 -C 4 )alkyl; R 7 is OH; or R 6 and R 7 together are ethylenedioxy; R 8 is (C 1 -C 4 )alkyl optionally comprising OH or halo; the bond represented by --- is present or absent; or a pharmaceutically acceptable salt thereof.