1 TT [(1r,3r,4s,9r,10s,12r,15as,15br,18br,18cs)-10-hydroxy-15a,15b-dimethyl-13,15,16,18-tetraoxohexadecahydro-8h-9,12-epoxy-1,4-methano-2,5,7-trioxa-12a,14,17,18a-tetraazacyclohexadeca[1,2,3,4-def]biphenylen-3-yl]methyl dihydrogen phosphate 1.000 2 TTD Cis-syn cyclobutane thymine dimer 0.905 3 WUH Thymine dimer 0.818 4 US4 [(2r,3s,5r)-3-({[(2r,3s,5r)-5-(6-amino-9h-purin-9-yl)-3-hydroxytetrahydrofuran-2-yl]methoxy}methoxy)-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2h)-yl)tetrahydrofuran-2-yl]methyl dihydrogen phosphate 0.756