How many chirality centers are present in pseudoephedrine,the amine shown below? 
Definitions:
Radiation
The emission and diffusion of rays; a product of X-ray and radium.
Wilhelm Konrad Roentgen
A German physicist who discovered X-rays in 1895, for which he received the first Nobel Prize in Physics in 1901.
X-ray
A form of electromagnetic radiation used in medical imaging to view the inside of the body, especially bones, to diagnose or monitor various conditions.
Marie Sklodowska Curie
A pioneering physicist and chemist who conducted groundbreaking work in radioactivity, and the first woman to win a Nobel Prize.
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