... requirements.we have our own factory. Norcantharidin CAS Number:5442-12-6Name:4,7-Epoxyisobenzofuran-1,3-dione,hexahydro-Molecular Structure ... ,3-dicarboxylicanhydride (8CI); 4,10-Dioxatricyclo[5.2.1.02,6]decane-3,5-dione; NSC 14003Molecular Formula:C8H8 O4Molecular Weight ... the product within 3-5days. High Quality Norcantharidin 99%,5442-12-6