7,11b-Dihydroindeno[2,1-c]chromene-3,4,6a,9,10(6H)-pentol
Haematoxylin is an organic heterotetracyclic compound 7,11b-dihydroindeno[2,1-c]chromene carrying five hydroxy substituents at positions 3, 4, 6a, 9 and 10. The most important and most used dye in histology, histochemistry, histopathology and in cytology. It has a role as a plant metabolite and a histological dye. It is an organic heterotetracyclic compound, a polyphenol, a tertiary alcohol and an oxacycle.