Excise exemption for drug intermediates enables duty-free supply when used in manufacture of specified bulk drugs. Full exemption from central excise duty is granted for specified intermediates within Chapters 28 and 29 when meant for manufacture of the named bulk drugs; the Table links listed intermediates to Centchroman, Chloramphenicol and Pyrazinamide and the exemption covers the whole of the duty leviable under the Tariff.