the rna was degraded to ribonucleosides , mixed with ultraviolet-absorbing quantities of the epoxide ribonucleoside products isolated from rna that had reacted with 7-methylbenz ( a ) anthracene 5,6-oxide in aqueous ethanol solution , and chromatographed on a column of sephadex lh-20 eluted with a methanol : water gradient .
C0001962
ethanol
C0001963
methanol