title: Photosensitized cycloadditions to 1,3-dimethyl-6-azauracil and 1,3-dimethyl-6-azathymine. An imine linkage unusually reactive toward photocycloaddition.
mesh_terms: D001372:Aza Compounds / Q000528:radiation effects; D003500:Cyclization; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D010777:Photochemistry; D011830:Radiation Effects; D013055:Spectrophotometry, Infrared; D013941:Thymine / Q000528:radiation effects*; D014466:Ultraviolet Rays; D014498:Uracil / Q000031:analogs & derivatives* / Q000528:radiation effects*
chemical_list: D001372:Aza Compounds; D014498:Uracil; D013941:Thymine