azathioprine

6-(1-Methyl-4-nitro-5-imidazolyl)thiopurine; a derivative of 6-mercaptopurine, used as a cytotoxic and immunosuppressive agent in organ transplantation and in the treatment of autoimmune diseases such as hemolytic anemias, systemic lupus erythematosus, rheumatoid arthritis and leukemias.


azolitmin

[old C.I. 1242]. A purplish red coloring matter obtained from natural litmus or synthesized by oxidizing orcinol in the presence of ammonia, lime, and potash; used as a broad indicator of pH (red at 4.5, blue at 8.3).


azure B

[C.I. 52010]. C15H16N3SCl; trimethylthionine chloride; a blue dye used like azure A; also as azure B bromide to give metachromatic staining of RNA and DNA.


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