title: Purine carbon-8 substituent as probe of the electronic structures of adenine and guanine. A computational study.
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004583:Electrons; D006147:Guanine / Q000031:analogs & derivatives*; D008722:Methods; D011522:Protons; D013056:Spectrophotometry, Ultraviolet
chemical_list: D011522:Protons; D006147:Guanine; D000225:Adenine