DEL Synthesis: We synthesize the designed libraries using advanced DNA-tagging techniques. During the process, each chemical building block is attached with a unique coding DNA, forming a large diversity of small molecule-DNA conjugates. We develop vast DNA-compatible chemical reactions, and have tens of thousands of building blocks as well as automated platforms that support the whole process of library synthesis, which can accurately and efficiently parallel tens of thousands of reactions. This allows us to complete product delivery quickly. At the same time, we have established a sound process control and final product quality evaluation system to ensure quality.