Tianjin Topwork Fine Chemical Co., Ltd. specializes in manufacturing corticosteroid and relative intermediates. We provide excellent products and super service to our clients. Topwork has gained admirable reputation in the world market. We have gathered a group of energetic, diligent, and experienced experts who dedicate their energy to research and developing new products. To guarantee our products, we have established an international standard quality control system; all products have the latest standard of USP, EP, BP and CP. For your safety, we have established industrial protection, c