prov:value
| - . 4) Preferable Embodiment [0050] The compound shown by the following formula (2) can be given as a preferable specific example of the organic compound (A2): [0051] wherein R1 and R2 individually represent a hydrogen atom, an alkyl group having 1-8 carbon atoms, for example a methyl, ethyl, propyl, butyl, cyclohexyl, octylgroup, or aryl group, for example a phenyl group, xylyl group, R3 is a dival
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