iminodiacetic acid

noun

im·​i·​no·​di·​ace·​tic acid ˌim-ə-ˌnō-ˌdī-ə-ˌsēt-ik- 

: an imino acid C₄H₇NO₄ that is the source of several derivatives used to visualize the hepatobiliary tract after labeling with a radioisotope of technetium