Patent ID: 8124651

Claim:
A compound, or salt thereof, having the general formula: wherein R 1 is H or OH; R 2 is selected from the group consisting of O(CH 2 )nCH 3 , OCH(CH 3 )CH 2 nCH 3 , OC(O)CH(CH 3 )NH 2 , OC(O)CH(CH 2 Phenyl)NH 2 , OC(O)CH(CH 2 p-OHPhenyl)NH 2 OC(O)CH(CH 2 OH)NH 2 , OC(O)CH(CH 2 SH)NH 2 , OC(O)CH(CH 2 COOH)NH 2 , OC(O)CH(CH 2 CH 2 COOH)NH 2 , OC(O)CH(CH 2 CONH 2 )NH 2 , OC(O)CH(CH 2 CH 2 CONH 2 )NH 2 , OC(O)CH(CH(CH 3 )CH 2 CH 3 )NH 2 , OC(O)CH(CH 2 CH(CH 3 ) 2 )NH 2 , OC(O)CH(CH(OH)CH 3 )NH 2 ; and n is 1-4, and R 3 is hydrogen, or NHNHC(CH 3 ) 2 CONH 2 , represents the option of having a double bond.