title: Halogen-substitution effect on the optical absorption bands of uracil.
mesh_terms: D001976:Bromouracil / Q000032:analysis; D005472:Fluorouracil / Q000032:analysis; D013056:Spectrophotometry, Ultraviolet; D014498:Uracil / Q000031:analogs & derivatives* / Q000032:analysis*
chemical_list: D001976:Bromouracil; D014498:Uracil; D005472:Fluorouracil