You're looking for information on the Chinese Pharmacopoeia 2020 and a possible free PDF download. Here's what I could gather:
As for a free PDF download, I couldn't find any official sources that provide the Chinese Pharmacopoeia 2020 in PDF format for free. The NMPA website and other official sources may offer information on the pharmacopoeia, but they usually don't provide a free PDF download. chinese pharmacopoeia 2020 pdf free download
The Chinese Pharmacopoeia (ChP) is the official pharmacopoeia of the People's Republic of China, published by the National Medical Products Administration (NMPA) of China. It sets the standards for the quality, testing, and usage of medicinal materials, including drugs, biological products, and medical devices. You're looking for information on the Chinese Pharmacopoeia