I want to buy these compound. These are usually used to detect H2O2. I have checked sigma chemical directory also http://www.chemexper.com/index.shtml but could not find out. I would appreciate if you have any information.
Please find a review articke, on the topic including requested substance. May be there has among the references cited, information about the different companies, providing exactly the chemical of your interest:
Luminescent probes for detection and imaging of hydrogen peroxide, M. Schaeferling, D. Groegel, S. Schreml, Microchim Acta, DOI 10.1007/s00604-011-0606-3