Input-output norms require imported inputs to match declared quantities and be used in the export product. Standard input-output norms specify permitted inputs and proportions for Amitriptyline manufacture-Phenyl Ethyl Benzoic Acid 0.93 kg, Bromo Chloro Propane 0.72 kg, Tetra Hydro Furan 0.53 kg per 1 kg product-and require applicants to ensure imported goods correspond to those inputs and are actually used in the export product.