| abstract |
A compound represented by the following formula:wherein R1 and R2 represent amino groups that substitute at adjacent positions on the phenyl ring, provided that either of R1 and R2 represents a mono(C1-6 alkyl)-substituted amino group and the other represents an unsubstituted amino group, and wherein R3 represents hydrogen atom or an alkyl group and R4 represents hydrogen atom or an acyl group, and an agent for measurement of nitrogen monoxide which comprises said compound. |