| http://www.w3.org/ns/prov#value | - lfonyl and benzyl, wherein the phenyl group is optionally substituted, a lipid, including a phospholipid, an L or D-amino acid, a carbohydrate, a peptide, a cholesterol, or other pharmaceutically acceptable leaving group which when administered in vivo is capable of providing a compound wherein R1 or R7 is independently H or phosphate; R1 and R7 can also be linked with cyclic phosphate group; and
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