Priority is assigned by atomic number: the atom connected to the stereocenter or double-
bonded carbon with the highest atomic number gets highest priority. If there is a tie, one works
outward from the stereocenter or double-bonded carbon until the tie is broken.
Switching a pair of substituents inverts stereochemistry; switching two pairs retains it. Rotating
the molecule 90° inverts stereochemistry; rotating 180° retains it.
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(singke)
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