1TSD:
reference: Ligand-induced distortion of an active site in thymidylate synthase upon binding anticancer drug 1843U89., Weichsel A, Montfort WR, Nat Struct Biol 1995 Dec;2(12):1095-101. PMID: 8846221

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).