Cl-4AS-1 is a dual anabolic–androgenic steroid (AAS) and 5α-reductase inhibitor.[1][2] It is a potent and selective full agonist of the androgen receptor (IC50 = 12 nM) and inhibitor of 5α-reductase types I and II (IC50 = 6 and 10 nM, respectively).[1][2] Structurally, Cl-4AS-1 is a 4-azasteroid.[1]
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