1	N6T	2'-deoxy-5'-O-[(S)-hydroxy{[(S)-hydroxy(phosphonoamino)phosphoryl]methyl}phosphoryl]-3,4-dihydrothymidine	1.000
2	UC5	2'-deoxy-5'-O-[(S)-hydroxy(phosphonomethyl)phosphoryl]uridine	0.767
3	44P	5'-O-[(S)-hydroxy(phosphonomethyl)phosphoryl]uridine	0.742