US Patent Issued to Jiangxi Caishi Pharmaceutical Technology on March 24 for "Pyridone derivative crystal form and preparation method and application therefor" (Chinese Inventors)

ALEXANDRIA, Va., March 24 -- United States Patent no. 12,583,867, issued on March 24, was assigned to Jiangxi Caishi Pharmaceutical Technology Co. Ltd. (Jiangxi, China).

"Pyridone derivative crystal form and preparation method and application therefor" was invented by Qing Shao (Suzhou, China), Libin Gan (Suzhou, China) and Li Chen (Suzhou, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "Crystals of (((R)-12'-((S)-7,8-difluoro-6,11-dihydrodibenzo[b,e]thiepin-11-yl)-6',8'-dioxo-6',8',12',12a'-tetrahydro-1'H,4'H-spiro[cyclopropane-1,3'-[1,4]oxazino[3,4-c]pyrido[2,1-f][1,2,4]triazin]-7'-yl)oxy)methyl methyl carbonate, i.e. compound of formula (1) or a solvate thereof and a preparation method therefor. The ...