sulfosalicylic acid
noun
sul·fo·sal·i·cyl·ic acid
variants:
or chiefly British sulphosalicylic acid \ ˌsəl-fō-ˌsal-ə-ˌsil-ik- 
\
\
Medical Definition of sulfosalicylic acid
: a sulfonic acid derivative C7H6O6S3 used especially to detect and precipitate proteins (as albumin) from urine