2′-Deoxy-5′-O-(1-hydroxy-20,20-dimethyl-1-oxido-2-oxa-15,16,17,18-tetraaza-1-phospha-20-silaheneicos-15-en-1-yl)uridylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

2′-Deoxy-5′-O-(1-hydroxy-20,20-dimethyl-1-oxido-2-oxa-15,16,17,18-tetraaza-1-phospha-20-silaheneicos-15-en-1-yl)guanylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

2′-Deoxy-5′-O-(1-hydroxy-20,20-dimethyl-1-oxido-2-oxa-15,16,17,18-tetraaza-1-phospha-20-silaheneicos-15-en-1-yl)cytidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

5′-O-(1-Hydroxy-20,20-dimethyl-1-oxido-2-oxa-15,16,17,18-tetraaza-1-phospha-20-silaheneicos-15-en-1-yl)thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine

2′-Deoxy-5′-O-(1-hydroxy-20,20-dimethyl-1-oxido-2-oxa-15,16,17,18-tetraaza-1-phospha-20-silaheneicos-15-en-1-yl)adenylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidylyl-(3′→5′)-thymidine