prov:value
| - wherein R1, through R6, independently represent a hydrogen atom, a fluorine atom, an alkyl group having a carbon atom number of from 1 to 6 such as a methyl group, an ethyl group, a propyl group or a butyl group, a fluoroalkyl group having a carbon atom number of from 1 to 6, an allyl group, an aryl group, or a furyl group; m is 2, 3 or 4; Z represents an oxygen atom, a sulfur atom, a divalent hyd
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