The molecule is a nucleoside 3',5'-cyclic phosphorothioate having 7-bromo-7-deazaadenine as the nucleobase (the Sp-stereoisomer). It is a N-glycosylpyrrolopyrimidine, a nucleoside 3',5'-cyclic phosphorothioate and an organobromine compound. It derives from a tubercidin.
(4aR,6R,7R,7aS)-6-(4-amino-5-bromopyrrolo[2,3-d]pyrimidin-7-yl)-2-hydroxy-2-sulfanylidene-4a,6,7,7a-tetrahydro-4H-furo[3,2-d][1,3,2]dioxaphosphinin-7-ol