X-GLUC Grade:ULTRA PURE GRADE CAS Number: 18656-96-7Synonym(s): None Molecular Weight: 521.80Molecular Formula: C20H26BrClN2O7 Storage Condition: FROZEN CodeSizePriceQuantity 0919-5MG Chromogenic substrate for the detection of b-glucuronidase. Commonly used to detect the GUS gene in bacterial colonies. Insoluble.