Product Name: Potassium indol-3-yl sulphate  
CAS Registry Number: 2642-37-7
IUPAC Name: potassium 1H-indol-3-yl sulfate 
Synonyms: 3-Indoxylsulfuric acid, potassium salt ; EINECS 220-145-5 ; Indol-3-ol, potassium sulfate ; Indol-3-yl potassium sulfate ; Indol-3-yl sulfate, potassium salt ; Potassium indol-3-yl sulfate ; Urinary indican ; Indol-3-ol, hydrogen sulfate (ester), potassium salt ; Indican 
Molecular Weight: 251.30084 [g/mol]
Molecular Formula: C₈H₆KNO₄S
H-Bond Donor: 1
H-Bond Acceptor: 4
Melting Point: 165 °C (dec.)(lit.)
Storage temp.: −20°C
Color: light yellow
Classification Code: Tumor data 
Related Registry Number: 487-94-5 (Parent)
Following is the molecular structure of Potassium indol-3-yl sulphate (CAS NO.2642-37-7) is:

Safty information about Indican (CAS NO.2642-37-7) is:
Questionable carcinogen with experimental tumorigenic data. When heated to decomposition it emits very toxic fumes of NO_x, K₂O, and SO_x. 
Safety Statements:
S22:Do not breathe dust. 
S24/25:Avoid contact with skin and eyes.
WGK Germany: 3
RTECS: NM3200000
F:
F8: Photosensitive.
F10: Keep under argon.
F23: Sensitive to air.

 Potassium indol-3-yl sulphate (CAS NO.2642-37-7) is a white to off-white crystalline powder.
First Aid Measures about it:
Eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.
Skin: Get medical aid. Flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes.
Ingestion: Get medical aid. Wash mouth out with water.
Inhalation: Remove from exposure and move to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. 
Handling and Storage about it:
Handling: Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
Storage: Store in a tightly closed container. Deep freeze (below -20°C).