| http://www.w3.org/ns/prov#value | - a peptide; a cholesterol; or other pharmaceutically acceptable leaving group which when administered in vivo is capable of providing a compound wherein R1 is independently H or phosphate; R6 is an alkyl, halogeno-alkyl (i.e. CF3), alkenyl, or alkynyl (i.e. allyl); and X is O, S SO2 or CH2 can be prepared by one of the following general methods. 1.
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