sulfobromophthalein
noun
sul·fo·bro·mo·phtha·lein
variants:
or chiefly British sulphobromophthalein \ ˌsəl-fə-ˌbrō-mō-ˈthal-ē-ən, -ˈthal-ˌēn, -ˈthāl- 
\
\
Medical Definition of sulfobromophthalein
: a diagnostic material used in the form of its disodium salt C20H8Br4Na2O10S2 in a liver function test