The millipede ejects the compound shown below to protect itself from its enemies. Identify the functional group circled. 
Definitions:
Vastus Lateralis
The largest and most powerful part of the quadriceps femoris, a muscle in the thigh that extends the leg at the knee.
Injection Site
The location on the body where an injection is given, typically chosen based on the type and volume of medication to be administered.
Endotracheal Tube
A medical device inserted into the trachea through the mouth or nose to maintain an open airway.
Cardiac Surgery
Operations on the heart or great vessels performed by cardiac surgeons to treat complications of heart disease, valvular heart disease, or to correct congenital heart disease.
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