Formula: C18H16N8Na2O7S3 3.5H2O Formula weight: 661.60 CAS Number: 104376-79-6 Harmonized Tariff Code:  2941.90 Risk Phrases: 36/37/38-42/43 Irritating to eyes, respiratory system and skin. May cause sensitisation by inhalation and skin contact. Safety Phrases: 22-24-26-37-45-60 …