| http://www.w3.org/ns/prov#value | - According to more preferred embodiments of the present invention, provided are the aforementioned fluorescent probe 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
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