5-(1-chlorovinyl)-2,4-bis((trimethylsilyl)oxy)pyrimidine

1-(3,5-di-O-acetyl-2-deoxy-β-D-erythro-pentofuranosyl)-5-(trimethylsilylethynyl)uracil

1-(3,5-di-O-acetyl-2-deoxy-β-D-erythro-pentofuranosyl)-5-ethynyluracil