50660
A face is labeled " re " if , when looking at that face , the substituents at the trigonal atom are arranged in decreasing Cahn-Ingold-Prelog priority order in a clockwise order , and " si " if the priorities decrease in counter-clockwise order ; note that the designation of the resulting chiral center as " S " or " R " depends on the priority of the incoming group .
 Cahn-Ingold-Prelog
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 Cahn-Ingold-Prelog