Product Name

  • Name

    Melengestrol acetate

  • EINECS 220-859-7
  • CAS No. 2919-66-6
  • Article Data4
  • CAS DataBase
  • Density 1.15 g/cm3
  • Solubility
  • Melting Point 202-204 °C(lit.)
  • Formula C25H32O4
  • Boiling Point 516.1 °C at 760 mmHg
  • Molecular Weight 396.527
  • Flash Point 221.7 °C
  • Transport Information
  • Appearance Light tan solid
  • Safety 36
  • Risk Codes 62
  • Molecular Structure Molecular Structure of 2919-66-6 (Melengestrol acetate)
  • Hazard Symbols IrritantXi
  • Synonyms Pregna-4,6-diene-3,20-dione,17-hydroxy-6-methyl-16-methylene-, acetate (7CI,8CI);17-Acetoxy-6-methyl-16-methylenepregna-4,6-diene-3,20-dione;17-Hydroxy-6-methyl-16-methylenepregna-4,6-diene-3,20-dione acetate;17a-Acetoxy-6-methyl-16-methylenepregna-4,6-diene-3,20-dione;6-Dehydro-16-methylene-17a-hydroxy-6a-methylprogesteroneacetate;6-Methyl-16-methylene-17a-hydroxy-4,6-pregnadiene-3,20-dione 17-acetate;BDH 1921;Heifermax 500;MGA;MGA 100;MGA 100 (steroid);MGA 264;NSC-70968;
  • PSA 60.44000
  • LogP 4.74140

Melengestrol acetate Chemical Properties


IUPAC Name: (17-Acetyl-6,10,13-Trimethyl-16-methylidene-3-oxo-1,2,8,9,11,12,14,15-octahydrocyclopenta[a]phenanthren-17-yl) acetate
EINECS: 220-859-7
Molecular Formula: C25H32O4
Molecular Weight: 396.52 g/mol
Melting Point: 202-204 °C(lit.)
storage temp.: 0-6 °C 
Index of Refraction: 1.554
Molar Refractivity: 110.58 cm3
Density: 1.15 g/cm3 
Flash Point: 221.7 °C
Boiling Point: 516.1 °C at 760 mmHg 
Molar Volume: 344.6 cm3
Surface Tension: 43.5 dyne/cm
Enthalpy of Vaporization: 78.81 kJ/mol 
Classification Code: Adrenal Cortex Hormones; Antineoplastic; Glucocorticoids; Hormone; Hormones; Hormones, Hormone Substitutes, and Hormone Antagonists; Progestin; Reproductive
Product Categories: Hormone; Steroids 
Vapour Pressure of Melengestrol acetate (CAS NO.2919-66-6): 9.29E-11 mmHg at 25 °C

Melengestrol acetate Uses

  Melengestrol acetate (CAS NO.2919-66-6) is approved for use as a growth promoter in livestock, including beef cattle, in the United States. Its use is not approved in the European Union or Canada.

Melengestrol acetate Safety Profile

An experimental teratogen. Experimental reproductive effects. When heated to decomposition it yields acrid smoke and irritating fumes.
Hazard Codes:HarmfulXn
Risk Statements: 62 
R62:Risk of impaired fertility.
Safety Statements: 36 
S36:Wear suitable protective clothing. 
WGK Germany: 3
RTECS: TU4141000

Melengestrol acetate Specification

  Melengestrol acetate (CAS NO.2919-66-6), its Synonyms are 17-Hydroxy-6-methyl-16-methylenepregna-4,6-diene-3,20-dione acetate ; 6-Dehydro-16-methylene-6-methyl-17-acetoxyprogesterone ; BDH 1921 ; CCRIS 7800 ; 17-(acetyloxy)-6-methyl-16-methylenepregna-4,6-diene-3,20-dione(9CI) ; Pregna-4,6-diene-3,20-dione, 17-(acetyloxy)-6-methyl-16-methylene- ; Pregna-4,6-diene-3,20-dione, 17-hydroxy-6-methyl-16-methylene-, acetate ; MGA ; MGA (Veterinary) ; MGA 100 ; MGA 100 (steroid) ; MGA 500 .

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