| http://www.w3.org/ns/prov#value | - For a fluorescent probe for measuring zinc ion, preferably, either of R1 and R2 is a group represented by the aforementioned formula (A) and the other is hydrogen atom, wherein X1, X2, X3, and X4 are preferably 2-pyridylmethyl groups, and more preferably X1 and X2 are 2-pyridylmethyl groups.
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