Molecular Structure of Methyl 4-methoxyacetoacetate (CAS NO.41051-15-4):

IUPAC Name: methyl 4-methoxy-3-oxobutanoate 
Empirical Formula: C₆H₁₀O₄
Molecular Weight: 146.1412
H bond acceptors: 4
H bond donors: 0
Freely Rotating Bonds: 5
Polar Surface Area: 52.6 Å²
Index of Refraction: 1.41
Molar Refractivity: 33.39 cm3
Molar Volume: 134.5 cm³
Surface Tension: 32.1 dyne/cm
Density: 1.086 g/cm³
Flash Point: 89.4 °C
Enthalpy of Vaporization: 45.2 kJ/mol
Boiling Point: 215.7 °C at 760 mmHg
Vapour Pressure: 0.146 mmHg at 25°C
Melting point: -80°C
InChI
InChI=1/C6H10O4/c1-9-4-5(7)3-6(8)10-2/h3-4H2,1-2H3
Smiles
C(C(=O)OC)C(=O)COC
EINECS: 255-188-9
Product Categories: Acetics acid and esters; C6 to C7; Carbonyl Compounds; Esters

Hazard Codes: Xi
Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing.
WGK Germany: 3
F: 10

  Methyl 4-methoxyacetoacetate , with CAS number of 41051-15-4, can be called 4-methoxy-3-oxo-butanoicacimethylester ; Butanoic acid, 4-methoxy-3-oxo-, methyl ester ; Methyl methoxyacetoacetate ; Methyl 4-methoxyacetoxyacetate ; Methyl 4-methoxy-3-oxo-butanoate ; 4-Methoxyacetoacetic acid methyl ester ; methyl 4-methoxy-3-oxobutyrate . It is a colorless to yellow liquid.