Sulfadimidine

Sulfadimidine or sulfamethazine is a sulfonamide antibacterial.

There are non-standardized abbreviations for it as "sulfadimidine" (abbreviated SDI and more commonly but less reliably SDD  ) and as "sulfamethazine" (abbreviated SMT  and more commonly but less reliably SMZ  ). Other names include sulfadimerazine, sulfadimezine, and sulphadimethylpyrimidine.