prov:value
| - on atoms and tertiary alkyl groups of 4 to 30 carbon atoms having the formulae (C1) and (C2), respectively. [0044] In formulae (C1) and (C2), R1 and R2 each are hydrogen or a straight, branched or cyclic alkyl group of 1 to 20 carbon atoms, which may contain a hetero atom such as oxygen, sulfur, nitrogen or fluorine, R3, R4, R5 and R6 each are a straight, branched or cyclic alkyl group of 1 to 20
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