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Procarbazine was initially synthesized as an MAO inhibitor. However, it was discovered later on that it has ability to act as an alkylating agent and inhibit DNA, RNA, and protein synthesis. Along with this, there is an opinion that procarbazine accumulates in cancerous tissue and generates peroxide and hydroperoxide radicals in cells, which imitates the effect of ionizing radiation. It is used for malignant tumors of lymphatic tissue, brain tumors, lung tumors, and Hodgkin's disease. A synonym of this drug is natulan.

Amsacrine: Amsacrine, 4-(9-acridinylamino)-3-methoxyphenyl-N-methansulfonamide (30.6.11), is made by sulfonating 4-nitro-m-anisidine with methanesulfonyl chloride, which forms a sulfonyl amide 30.6.9, and the nitro group is reduced to an amino group by hydrogen, forming 4-amino-3-methoxyphenyl-N-methansulfonamide (30.6.10). Reacting this with 9-chloroacridine gives amsacrine (30.6.11) [151-153].

Amsacrine is a drug undergoing intensive trials for severe leukemia and lymphoma. It is a cytotoxic drug that binds with DNA with expressed specificity to the adenosine-tyrosine pair, thus inhibiting DNA synthesis. It has been suggested to be used for severe leukemia. A synonym of this drug is amsidyl.

Asparaginase: Asparaginase is an enzyme that hydrolyzes L-asparagine to L-aspartic acid, which causes a depletion of reserves of L-asparagine, thus inhibiting protein and nucleic acid synthesis. It is effective for severe lymphocyte leukemia [154]. A synonym of this drug is elspar.

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