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Product Description: 4-Methylumbelliferyl butyrate (4-MUB) is a coumarin-based fluorogenic substrate used for the identification of M. catarrhalis C4- esterase. 4-Methylumbelliferyl butyrate can converse to the blue-emissive 4-methylumbelliferone (4-MU; HY-N0187)[1].