IUPAC Name: 4-Chlorothieno[3,2-d]pyrimidine 
Empirical Formula: C₆H₃ClN₂S
Molecular Weight: 170.6194
Canonical SMILES: C1=CSC2=C1N=CN=C2Cl
InChI: InChI=1S/C6H3ClN2S/c7-6-5-4(1-2-10-5)8-3-9-6/h1-3H
XLogP3: 1.8
H-Bond Donor: 0
H-Bond Acceptor: 2 
Index of Refraction: 1.71
Molar Refractivity: 43.557 cm³
Molar Volume: 111.427 cm³
Surface Tension: 66.696 dyne/cm
Density: 1.531 g/cm³
Flash Point: 126.572 °C
Enthalpy of Vaporization: 50.368 kJ/mol
Boiling Point: 285.674 °C at 760 mmHg
Vapour Pressure: 0.005 mmHg at 25°C
Melting point: 125-126 º C
Product Categories of 4-Chlorothieno[3,2-d]pyrimidine (CAS NO.16269-66-2): CHIRAL CHEMICALS

Hazard Codes: Xn,Xi
Risk Statements: 22-36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin. 
R22:Harmful if swallowed.
Safety Statements: 26-37/39 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S37/39:Wear suitable gloves and eye/face protection.
Hazard Note of 4-Chlorothieno[3,2-d]pyrimidine (CAS NO.16269-66-2): Irritant

  4-Chlorothieno[3,2-d]pyrimidine (CAS NO.16269-66-2), its Synonyms are Thieno[3,2-d]pyrimidine, 4-chloro- ; 4-Chlorothieno[3,2-d]pyrimidine ,97% ; 4-Chlorothieno[3,2-b]pyrimidine .