What is the starting material in the following reaction? 
Definitions:
Kingpin
A critical component in the steering mechanism of a vehicle, particularly in the connection between the axle and wheel.
Ackerman Arms
Component parts of a vehicle's steering mechanism that help to achieve the correct angle for the tires during turning.
Single Axle Truck
A type of truck or vehicle with only one rear axle, often used for smaller or medium-sized loads.
Tie-rod End Ball Socket
A pivotal connection point in a vehicle's steering system enabling the wheels to turn.
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