EC21 Product Catalogs - y b chem http://www.ec21.com/ec-market/y b chem.html Bulk Drugs Pharma Intermediateshttp://amychemica.en.ec21.com/Bulk_Drugs_Pharma_Intermediates--2263876_2263909.htmlb,e]oxepin-11-one,CAS 4504-87-4, a intermediate of chemicals and pharmaceuticals Bulk Drug, Pharmaceutical Intermediat20090622