1 CP1 2-(methylamino)-ethylglycine-carbonylmethylene-cytosine 1.000 2 TP1 2-(methylamino)-ethylglycine-carbonylmethylene-thymine 0.864 3 CPN 2-aminoethylglycine-carbonylmethylene-cytosine 0.857 4 40C N-[(4-amino-2-oxopyrimidin-1(2h)-yl)acetyl]-N-[(2s)-2-aminopropyl]glycine 0.818 5 IPN 2-aminoethylglycine-carbonylmethylene-5-iodouracil 0.739 6 TPN 2-aminoethylglycine-carbonylmethylene-thymine 0.739 7 40T N-[(2s)-2-aminopropyl]-N-[(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2h)-yl)acetyl]glycine 0.708