the diacetyl derivative of 4-hydroxyaminoquinoline 1-oxide ( 4-haqo ) , the proximate carcinogen of 4-nitroquinoline 1-oxide , was reacted in vitro with purine nucleosides to give five adducts ( three with guanosine and two with adenosine ) .
C0034136
purine nucleosides
C0001443
adenosine