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3,3'-Diheptylthiacarbocyanine iodide is a cyanine dye for measuring membrane potential.

3,3′-Diheptylthiacarbocyanine iodide [DiSC7(3)], a cyanine dye, may be used similar to 3,3′-dipropylthiadicarbocyanine iodide [DiSC(3)(5)] for membrane potential studies.

433 nm/500 nm