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OSI-7904L is a novel noncompetitive liposomal thymidylate synthase inhibitor. OSI-7904 is a benzoquinazoline folate analog with antineoplastic activity. As a thymidylate synthase inhibitor, OSI-7904 noncompetitively binds to thymidylate synthase, resulting in inhibition of thymine nucleotide synthesis and DNA replication.[1]

OSI-7904L is a liposome-encapsulated formulation of OSI-7904. Liposome encapsulation improves the efficacy and increases the half-life of OSI-7904.[1]

Its effect on solid tumours is currently under evaluation.[2][3][4]