Crystal and molecular structure of adenosine 3',5'-cyclic phosphate

The structure of adenosine 3',5'-cyclic phosphate has been determined by single-crystal x-ray diffraction. The two molecules in the asymmetric unit show different conformation about the glycosidic bond, while other structural details are essentially the same. The furanose rings are puckered with the C(4') atom out of the best four-atom plane. The bond lengths and angles appear to be normal.