Alrestatin Aldose reductase inhibitor Aldose reductase inhibitor. Product Specification Formula: C14H9NO4 MW: 255.2 CAS: 51411-04-2 Purity: ≥99% (HPLC) Identity: Determined by 1H-NMR and MS. Appearance: White crystalline solid. Solubility: Soluble in DMSO. Long Term Storage: Ambient