Andarine (S4) or S-40503 Chemical Name: S-3-(4-acetylamino-phenoxy)-2-hydroxy-2-methyl-N-(4-nitro-3-trifluoromethyl-phenyl)-propionamide CAS:401900-40-1 Molecular formula: C19H18F3N3O6 Molecular weight: 441.36 Andarine (S4) Appearance: Pale Yellow Solid Andarine (S4) Melting Point: 170-171 °C Andarine, commonly known as S4 Andarine S4 is a Selective Androgen Receptor Modulator (SARM) developed by GTx. Like all SARM’s S4 was developed in the treatment of muscle wasting diseases with benign prostatic hypertrophy treatment also being high …