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Synthesis of novel 16 - spiro steroids : Spiro - 7 ' - ( aryl ) tetrahydro - 1H - pyrrolo [ 1 , 2 - c ] [ 1 , 3 ] thiazolo - trans - androsterone hybrid heterocycles .
 16 - spiro steroids, Spiro - 7 ' - ( aryl ) tetrahydro - 1H - pyrrolo [ 1 , 2 - c ] [ 1 , 3 ] thiazolo - trans - androsterone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 16 - spiro steroids, Spiro - 7 ' - ( aryl ) tetrahydro - 1H - pyrrolo [ 1 , 2 - c ] [ 1 , 3 ] thiazolo - trans - androsterone