138921-14-9 6H-Purin-6-one-8-t,2-amino-9-(2,3-bis(hydroxymethyl)cyclobutyl)-1,9-dihydro-, (1alpha,2beta,3alpha)-(+-)- A 69992 A 75179 A 75962 A-69992 A-75179 A-75962 Abbott 69992 Abbott-69992