(2S)-2,5'-anhydro-1-(2'-deoxy-beta-D-erythro-pentofuranosyl)-5-guanidinylidene-2-hydroxy-4-oxoimidazolidine
(2s)-2,5'-anhydro-1-(2'-deoxy-beta-d-erythro-pentofuranosyl)-5-guanidinylidene-2-hydroxy-4-oxoimidazolidine