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Is the molecule "R" or "S"?
1. Find the chiral carbon atom
2. Number the substituents using Cahn-Ingold-Prelog Priorities
3. Orient the molecule so #4 is behind the chiral carbon
4. When you move from 1 to 2 to 3, and draw a circle, it is R if you are moving Right at the top and S if you're moving left at the top