| 摘要 |
PROBLEM TO BE SOLVED: To provide a new potential sensitivity coloring matter for measuring active potential of a nerve cell and a heart muscle cell rapidly with high sensitivity. SOLUTION: The potential sensitivity coloring matter contains a coumarin derivative expressed by the following expression I or its salt (in the expression, each of R1 , R2 , R3 , R4 , R5 , R6 , and R6 indicates a hydrogen atom, an alkyl group that may have a substitution group, an alkenyl group that may have a substitution group, or an ayl group that may have a substitution group that are independent one another. R1 and R7 , or R1 and R2 , or R2 and R3 are partially combined to form a five-membered or six-membered ring. A indicates a three- or ten-membered saturation or nonsaturation hetero ring group, and these may have a substitution group.).
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