M 0639 (OTTO) Methylenediphosphonic acid, ≥99% Cas no 1984-15-2 - used as a radioactive imaging agent, which is primarily used in skeletal scintigraphy. Due to its absorption by a variety of tumors, it is useful for the detection of neoplasms. M 0639 (OTTO) Methylenediphosphonic acid, ≥99% Cas no 1984-15-2 - used, complexed with radioisotopes in bone imaging.