the monofunctional and bifunctional furocoumarin derivatives 8-methyl-3-carbethoxypsoralen ( 8me3cps ) and 8-methoxypsoralen ( 8mop ) as well as their thiosubstituted derivatives ( 2-thio-8me3cps and 2-thio-8mop ) were compared in terms of their reactivities towards a ribonucleoprotein , the bacteriophage ms2 .
C0016859
furocoumarin
C0025684
8-methoxypsoralen