prov:value
| - Specific embodiments of the present invention include those wherein R2 is a methyl group, R3 is a methyl group, and R4 is a hydroxyl group, those wherein R2 is a methyl group, R3 is a methyl group, and R4 is a hydroxyalkane, hydroxyalkene, glycyl, glycosaccharides, or water soluble sidechain, or those wherein R2 is an ethyl group, R3 is a hydroxyl group, and R4 is an ethyl group.
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