Used as an intermediate in the synthesis of fluorescent dyes and optical brighteners due to its conjugated aromatic structure and nitro group that enhances light absorption properties. Its hydroxyl and nitro functional groups allow for further chemical modifications, making it valuable in developing sensors for metal ion detection. Also investigated for use in photodynamic therapy agents because of its ability to generate reactive oxygen species under light exposure. Additionally, it serves as a building block in organic semiconductors and luminescent materials for OLEDs.