Chemistry informtion about N-Amylene Pentene (CAS NO.25377-72-4) is:
IUPAC Name: Pent-1-Ene
Synonyms: 1-Amylene ; Alpha-Amylene ; Amylene ; N-Amylene ; Pent-1-Ene ; Pentene ; Trimethylethylene ; Pentene,Technical
MF: C₅H₁₀
MW: 70.13
EINECS: 203-694-5
Density: 0.66 g/cm³
Melting Point: -165 °C
Flash Point: −20 °F
Boiling Point: 29.9 °C at 760 mmHg
Vapour Pressure: 637 mmHg at 25°C
Enthalpy of Vaporization: 25.2 kJ/mol
Refractive Index: n20/D 1.371(lit.)
Following is the molecular structure of N-Amylene Pentene (CAS NO.25377-72-4) is:

 N-Amylene Pentene (CAS NO.25377-72-4) is made as a byproduct of catalytic or thermal cracking of petroleum, or during production of ethylene and propylene via thermal cracking of hydrocarbon fractions.

Reported in EPA TSCA Inventory.

Moderately toxic. Very flammable; reacts with heat, flame, and oxidizing materials. To fight fire, use foam, CO₂, dry chemical.
Hazard Codes:
F+
Xn
Risk Statements:
R12:Extremely flammable. 
R52/53:Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. 
R65:Harmful: may cause lung damage if swallowed.
Safety Statements:
S61:Avoid release to the environment. Refer to special instructions / safety data sheets. 
S62:If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label.
RIDADR: UN 1108 3/PG 1
WGK Germany: 3

DOT Classification:  3; Label: Flammable Liquid

First Aid Measures:
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:
Handling: Use spark-proof tools and explosion proof equipment. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.
Storage: Keep away from sources of ignition. Keep refrigerated. (Store below 4°C/39°F.) Keep container closed when not in use. Store in a dry area. Flammables-area.