Molecular structure of p-Isopropylcinnamic acid (CAS NO.3368-21-6) is:

Product Name: p-Isopropylcinnamic acid
CAS Registry Number: 3368-21-6
IUPAC Name: (E)-3-(4-propan-2-ylphenyl)prop-2-enoic acid
Molecular Weight: 190.23836 [g/mol]
Molecular Formula: C₁₂H₁₄O₂
XLogP3: 3.3
H-Bond Donor: 1
H-Bond Acceptor: 2 
EINECS: 222-138-2
Melting Point: 157-159°C
Index of Refraction: 1.575
Molar Refractivity: 57.89 cm³
Molar Volume: 175.1 cm³
Surface Tension: 42.4 dyne/cm
Density: 1.086 g/cm³
Flash Point: 221.5 °C
Enthalpy of Vaporization: 58.95 kJ/mol
Boiling Point: 317 °C at 760 mmHg
Vapour Pressure: 0.000167 mmHg at 25°C
Product Categories: Aromatic Cinnamic Acids, Esters and Derivatives

Hazard Codes: Xi
Hazard Note: Irritant

 p-Isopropylcinnamic acid , its cas register number is 3368-21-6. It also can be called AI3-23710 ; Cinnamic acid, p-isopropyl- ; NSC 216 ; 2-Propenoic acid, 3-(4-(1-methylethyl)phenyl)- . It is a 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.
Notes to Physician: Treat symptomatically and supportively. 
Handling and Storage about it:
Handling: Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes. Avoid ingestion and inhalation.
Storage: Store in a cool, dry place. Store in a tightly closed container.