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Molecular formula: C₁₄H₈N₂Na₂O₁₀S₂
Molecular weight: 474.32
CAS number: 2861-02-1
Structural formula:

Appearance: Blue powder
Shade: Approximate
Tinting strength: ±5%
Weight loss (105°C): ≤1.5%
Water solubles: ≤1.5%