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What does 4-MA stand for?

4-MA stands for alpha-androstan-3-one

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A series of chemical reactions spurred by proteins called enzymes remove and add groups to cholesterol's polycyclic (many-ringed) core. These actions transform cholesterol first into the steroid pregnenolone, then into testosterone and other androgens. In humans and other vertebrates, androgens are made primarily in the male testes, female ovaries, and adrenal glands. Kinds and potencies vary among animal groups. Testosterone and dihydrotestosterone (17-beta-hydroxy-5-alpha-androstan.
13-ethyl-3-methoxy-gona-2,5(10) dien-17-one and 17-beta-hydroxy-2-apha,17-dimethyl-5-alpha-androstan.
They are found both in males and females and are synthesized primarily in the male testes, female ovaries, and adrenal glands, respectively. The most potent androgens are testosterone and dihydrotestosterone (17-beta-hydroxy-5-alpha-androstan.
(3) Immediate precursor to fentanyl: (i) 4-anilino-N-phenethyl-4-piperidine (ANPP). (h) Anabolic steroids. Unless specifically excepted or unless listed in another schedule, "anabolic steroid" shall mean any drug or hormonal substance, chemically and pharmacologically related to testosterone (other than estrogens, progestins, corticosteroids and dehydroepiandrosterone) and includes: (1) 3{beta}, 17-dihydroxy-5a-androstane. (2) 3{alpha}, 17{beta}-dihydroxy-5a-androstane. (3) 5{alpha}-androstan.
(liii) oxymetholone (17[alpha]-methyl-2-hydroxymethylene-17[beta]- hydroxy-[5[alpha]]-androstan.
Classified as a Schedule III drug under the Anabolic Steroids Control Act of 1990, Masteron has the chemical name of 2 alpha-methyl-17 beta-hydroxy-5 alpha-androstan-3-one and anabolic-androgenic ratio of 62:25. It has the molecular weight of 360. 5356 g/mol at the base, can be detected over a period of three weeks, and its molecular formula is C23H36O3. This anabolic compound is available in two forms: Masteron propionate and Masteron enanthate and the primary difference between them that while the enanthate version is slow but long acting, the propionate version is fast but is required to be injected every other day.
Classified as a Schedule III drug under the Anabolic Steroids Control Act of 1990, Masteron or Drostanolone has the chemical name of 2 alpha-methyl-17 beta-hydroxy-5 alpha-androstan-3-one and anabolic-androgenic ratio of 62:25. It has the molecular weight of 360. 5356 g/mol at the base and its molecular formula is C23H36O3.