Patent ID: 7989188

Claim:
A compound represented by general formula (I): wherein, A denotes the side chain of an amino acid, wherein the amino acid is selected from the group consisting of asparagine, glutamine, aspartic acid, or glutamic acid; D denotes the residue of a pyrimidine or purine antagonist selected from the group consisting of 2,4-dioxo-5-fluoropyrimidine (5-FU), fluorodeoxyuridine (5-FUDR), azacytidine (5-AZC), 6-mercaptopurine (6-MP), 6-thioguanine (6-TG), chlorodeoxyadenosine (2-CDA) and pentostatin (dCF), R 1 and R 2 are independently selected from a group consisting of hydrogen, a lower alkyl, a C 1 -C 20 fatty acid, and a sugar moiety; R 3 is selected from the group consisting of H and lower alkyl; and X is selected from the group consisting of a carboxyl, an amide, a hydrazide, an ester, a thioester, and an aldehyde.