DETAILED DESCRIPTION OF THE INVENTION Compounds of this invention, also referred to as "the compounds," comprise both fixed and variable moieties, which variable moieties are identified by a capital letter and accompanying numerical and/or alphabetical superscript, and for which the following terms have the meanings indicated.
"Alkenyl" means monovalent, straight-chain and branched-chain hydrocarbon moieties, having two to eight carbon atoms and at least one carbon-carbon double bond, attached through a carbon atom.
Examples of alkenyl moieties include but-1,3-dienyl, butenyl, but-2-enyl, ethenyl, 1-ethylhexen-2-yl, hex-3-enyl, 1-methylbutenyl, 2-methylbutenyl, 1-methylbut-2-enyl, 1-methylbut-1,3-dienyl, pentenyl, pent-2-enyl, pent-3-enyl, and propenyl.
"Alkyl" means monovalent, saturated, straight-chain and branched-chain hydrocarbon moieties, having one to six carbon atoms, attached through a carbon atom.
Examples of alkyl moieties include butyl, 1,1, -dimethylethyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl, ethyl, 1-ethylpropyl, 2-ethylpropyl, hexyl, methyl, 2-methylpropyl, 3-methylbutyl, 1-methylpentyl, 2-methylpent-3-yl, and pentyl.
"Alkylene" means divalent, saturated, straight-chain and branched-chain hydrocarbon moieties, having one to eight carbon atoms, attached through carbon atoms.
Examples of alkylene moieties include butylene, 1,1,-dimethylethylene, 1,1-dimethylpropylene, 1,2-dimethylpropylene, ethylene, 1-ethylpropylene, 2-ethylpropylene, hexylene, methylene, 2-methylpropylene, 3-methylbutylene, 1-methylpentylene, 2-methyl-2-ethylpropylene, and pentylene.
"Alkynyl" means monovalent, straight-chain and branched-chain hydrocarbon moieties, having two to six carbon atoms and at least one carbon-carbon triple bond, attached through a carbon atom.
Examples of alkynyl moieties include ethynyl (acetylenyl), pentynyl, pent-2-ynyl, pent-3-ynyl, pent-4-ynyl, 1-methylbut-2-ynyl, 2-methylbut-3-ynyl, hexynyl, hex-2-ynyl, hex-3-ynyl, hex-4-ynyl, 1-methyl-pent-2-ynyl, 1-methylenepent-3-ynyl, 1-methyl-pent-2,4-diynyl, and prop-2-ynyl (propargyl)
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Gene Therapy 
