Diaminofluorescein derivatives

摘要

A compound represented by the following formula (I):wherein R<1 >and R<2 >represent amino groups that substitute at adjacent positions on the phenyl ring, provided that either of R<1 >and R<2 >represents a mono(C1-6 alkyl)-substituted amino group and the other represents an unsubstituted amino group; and R<3 >and R<4 >independently represent hydrogen atom or an acyl group, and an agent for measurement of nitrogen monoxide which comprises said compound.