prov:value
| - alkyl. In a preferred embodiment, n is 1, 2, 3, or 4. Most preferably, R.sub.2 is a C.sub.1 alkyl, C.sub.2 alkyl, C.sub.3 alkyl, or C.sub.4 alkyl, and n is 2, 3 or 4, or a combination thereof. In another most preferred embodiment, R2 is a C.sub.5
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