| http://www.w3.org/ns/prov#value | - cyl, or other pharmaceutically acceptable leaving group which when administered in vivo, is capable of providing a compound wherein R.sup.2 is H or phosphate; sulfonate ester including alkyl or arylalkyl sulfonyl including methanesulfonyl, benzyl, wherein the phenyl group is optionally substituted with one or more substituents as described in the definition of aryl given above, a lipid, an amino a
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