phthalylsulfathiazole
noun
phthal·yl·sul·fa·thi·a·zole
variants:
or chiefly British phthalylsulphathiazole \ ˈthal-ˌil-ˌsəl-fə-ˈthī-ə-ˌzōl 
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Medical Definition of phthalylsulfathiazole
: a sulfonamide C17H13N3O5S2 used in the treatment of intestinal infections