5′-Thymidylic acid, anhydride with P,P′-ethylidenebis[phosphonic acid] (1:1)

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-1H-pyrido[3,2-b]pyrimido[4,5-e][1,4]oxazin-2(3H)-one

3-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-1H-pyrido[3,2-b]pyrimido[4,5-e][1,4]oxazin-2(3H)-one

3-(2-Deoxy-β-D-erythro-pentofuranosyl)-1H-pyrido[3,2-b]pyrimido[4,5-e][1,4]oxazin-2(3H)-one