title: Interactions between purine derivatives: electronic spectral studies. I. Electronic transitions in caffeine monomer and exciton coupling in caffeine dimer.
mesh_terms: D002110:Caffeine; D055598:Chemical Phenomena; D002621:Chemistry; D002942:Circular Dichroism; D008956:Models, Chemical; D008968:Molecular Conformation; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002110:Caffeine