| http://www.w3.org/ns/prov#value | - The organic medium (C) is preferably at least one kind of organic solvent satisfying water solubility in the above range, selected from esters such as methyl acetate, ethyl acetate, propyl acetate and butyl acetate, ketones such as acetone, methyl ethyl ketone, diethyl ketone and methyl isobutyl ketone, alcohols such as ethanol, (iso) propanol and butanol, ethers such as tetrahydrofuran, tetrahydr
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