#Piroxicam (#C15H13N3O4S) is a #nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, inflammation, and stiffness caused by arthritis. Its molecular structure consists of a pyridine ring, a carboxamide (-CONH-) functional group, and a thioxanthene ring. Carbon atoms in the carboxamide are sp2 hybridized, while those in the rings are sp3 hybridized.