Molecular structure of Thiamorpholine (CAS NO.123-90-0) is:

Product Name: Thiamorpholine
CAS Registry Number: 123-90-0
IUPAC Name: thiomorpholine
Molecular Weight: 103.18596 [g/mol]
Molecular Formula: C₄H₉NS
XLogP3-AA: 0.2
H-Bond Donor: 1
H-Bond Acceptor: 1 
EINECS: 204-660-2
Sensitive: Air Sensitive
Density: 1.012 g/cm³
Flash Point: 60 °C             
Boiling Point: 170 °C at 760 mmHg        
Index of Refraction: 1.499        
Vapour Pressure: 1.5 mmHg at 25°C  
Melting point: 166-168 °C
Refractive index: n20/D 1.538(lit.)
Related Registry Number: 5967-90-8 (hydrochloride) 
Product Categories: Morpholines & Thiomorpholines;Morpholines & Thiomorpholines;Ring Systems

 Thiamorpholine (CAS NO.123-90-0) can be considered a thio derivative of morpholine.It's derivatives are commonly developed as pharmaceuticals.

Hazard Codes: C,Xi
Risk Statements: 34-37-36/37/38 
R34:Causes burns. 
R37:Irritating to respiratory system 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36/37/39-45-36 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S36:Wear suitable protective clothing.
RIDADR: UN 3267 8/PG 3
WGK Germany: 3
F: 10-13-23
Hazard Note: Irritant
HazardClass: 8
PackingGroup: III

 Thiamorpholine , its cas register number is 123-90-0. It also can be called 1,4-Thiazane ; 1-Thia-4-azacyclohexane ; Parathiazan ; Tetrahydro-1,4-thiazine ; Thiamorpholine .It is a clear colorless to yellow liquid.