IUPAC Name: ethyl 2-amino-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carboxylate 
Empirical Formula: C₁₀H₁₃NO₂S
Molecular Weight: 211.2807g/mol
Structure of 4H-Cyclopenta[b]thiophene-3-carboxylicacid, 2-amino-5,6-dihydro-, ethyl ester (CAS NO.4815-29-6):

Index of Refraction: 1.614
Molar Refractivity: 57.45 cm³
Molar Volume: 164.6 cm³
Polarizability: 22.77×10^-24cm³
Surface Tension: 54.3 dyne/cm
Density: 1.282 g/cm³
Flash Point: 187.7 °C
Enthalpy of Vaporization: 63.58 kJ/mol 
Melting Point: 90-94 °C
Boiling Point: 386.8 °C at 760 mmHg
Vapour Pressure: 3.45E-06 mmHg at 25°C 
Product Categories: Thiophene 
Canonical SMILES: CCOC(=O)C1=C(SC2=C1CCC2)N
InChI: InChI=1S/C10H13NO2S/c1-2-13-10(12)8-6-4-3-5-7(6)14-9(8)11/h2-5,11H2,1H3
InChIKey: BOJXCJDYZJSPMZ-UHFFFAOYSA-N

Hazard Codes: Xn,Xi
Risk Statements: 20/22
R20/22:Harmful by inhalation and if swallowed.
Safety Statements: 22
S22:Do not breathe dust.
HazardClass: IRRITANT

  4H-Cyclopenta[b]thiophene-3-carboxylicacid, 2-amino-5,6-dihydro-, ethyl ester , its cas register number is 4815-29-6. It also can be called 2-Amino-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carboxylic acid ethyl ester ; 2-Amino-cyclopentano-[b]-thiophen-3-carbonsaeureethylester ; Ethyl 2-Amino-4H,5H,6H-Cyclopenta[B]Thiophene-3-Carboxylate ; Ethyl 2-amino-5,6-dihydro-4H-cyclopenta[b]-thiophene-3-carboxylate ; Ethyl 2-aminocyclopenta[b]thiophene-3-carboxylate . 4H-Cyclopenta[b]thiophene-3-carboxylicacid, 2-amino-5,6-dihydro-, ethyl ester (CAS NO.4815-29-6) is a light yellow to beige-brown crystalline powder.