prov:value
| - When R??? is aliphatic, it is preferably alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, ???C8H17, and the like; alkyl substituted with a non-interfering substituent, such as halogen, alkoxy or nitro; or alkyl conjugated to a biologically active substance to form a pendant drug delivery system.
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