H 1220 (OTTO) Hematin Cas 15489-90-4 - used in a study to test in vitro activities of the Rx-01 oxazolidinones against hospital and community pathogens. H 1220 (OTTO) Hematin Cas 15489-90-4 used in a study to test in-vitro bacterial identification using fluorescence spectroscopy with an optical fiber system.