| http://www.w3.org/ns/prov#value | - In the general formula (e), R10 and R11 are, independently of each other, a hydrogen atom or alkyl group, R12 is ???[CH2]x??? (x being 0 or 1), ???O???[CH2]y??? (y being 1 or 2) or a phenylene group, and M is a hydrogen atom or alkali metal.
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