Formula: C₃₇H₄₄N₂O₁₃S CAS: 1945-77-3 EC No.: 217-759-0 M (Molar Mass): 756.82 g/mol D (Density): ~1.0 g/cm³ (approx.) mp (Melting Point): Decomposes bp (Boiling Point): Not applicable Optical Rotation: Not applicable

Assay (Chelating Value): Suitable for use as metallochromic indicator. Appearance: Dark blue to black powder. Identification (Color Reaction): With metal ions (e.g., Zn²⁺, Pb²⁺), produces distinct color change from blue to yellow/orange. Solubility (in Water/NaOH): Passes test (blue solution). Loss on Drying: ≤ 5.0 % Suitability for Complexometry: Complies with titration tests against standard metal ion solutions.