5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-[22-methyl-6-[16-methyl-15,15-bis(1-methylethyl)-2,5,8,11,14-pentaoxa-15-silaheptadec-1-yl]-21,21-bis(1-methylethyl)-4,8,11,14,17,20-hexaoxa-21-silatricos-1-yn-1-yl]uridine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-[30-methyl-29,29-bis(1-methylethyl)-4,7,10,13,16,19,22,25,28-nonaoxa-29-silahentriacont-1-yn-1-yl]uridine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-[3-[2-[[tris(1-methylethyl)silyl]oxy]ethoxy]-1-propyn-1-yl]uridine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-[18-methyl-17,17-bis(1-methylethyl)-4,7,10,13,16-pentaoxa-17-silanonadec-1-yn-1-yl]uridine

N-[Hydroxy[[hydroxy[[hydroxy[(2′-deoxy-5′-guanylyl)oxy]phosphinyl]oxy]phosphinyl]oxy]phosphinyl]-L-aspartic acid