9-(5-phosphonopent-2-en-1-yl)guanine diethyl phosphonoester

(Z)-(5-(4-hydroxy-2-oxopyrimidin-1(2H)-yl)pent-3-en-1-yl)phosphonic acid

1-(5-phosphonopent-2-en-1-yl)cytosine

(Z)-(5-(4-hydroxy-5-methyl-2-oxopyrimidin-1(2H)-yl)pent-3-en-1-yl)phosphonic acid