Claim: The formula of Oxyphenbutazone, a nonsteroidal anti-inflammatory drug which was withdrawn from markets worldwide due to risk for Stevens-Johnson syndrome, is C19H20N2O3 while its molar mass is 324.380 grams.
Evidence: Oxyphenbutazone is a nonsteroidal anti-inflammatory drug (NSAID). It was withdrawn from markets worldwide in mid-1980s due to bone marrow suppression and risk for Stevens–Johnson syndrome. C19H20N2O3 324.380 g·mol