G 1665 (OTTO) Gallium(III) nitrate, hydrate, 99.9% Cas 69365-72-6 - used in the preparation of gallium nitride and other gallium compounds. It acts as a drug used to treat symptomatic hypercalcemia secondary to cancer. It finds application as an antineoplastic agent and also as an acting agent for the treatment of bone-resorptive diseases. It is involved to improve the cultural selectivity of medically significant fungi by suppression of contaminating bacterial flora.