The molecule is an AMP-sugar in which the 2'-hydroxy group of AMP carries a 5-phospho-beta-D-ribosyl substituent, the 2-hydroxy group of which itself carries a further 5-phospho-beta-D-ribosyl substituent. Branched portion of poly(ADP-Rib) [poly(adenosine diphosphate ribose)].
[(2R,3R,4R,5R)-5-(6-aminopurin-9-yl)-4-[(2S,3R,4R,5R)-3-[(2S,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]oxy-4-hydroxy-5-(phosphonooxymethyl)oxolan-2-yl]oxy-3-hydroxyoxolan-2-yl]methyl dihydrogen phosphate