| http://www.w3.org/ns/prov#value | - The fluorescent probe according to claim 1, which is for measuring zinc ion or nitrogen monoxide and wherein either or both of R1 and R2 are a group represented by the following formula (A): (wherein X1, X2, X3, and X4 each independently represents hydrogen atom, an alkyl group, 2-pyridylmethyl group, or a protective group of amino group, and m and n each independently represents 0 or 1). 8.
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