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Pregnenolone sulphate ( PREGS ) has generated interest as one of the most potent memory - enhancing neurosteroids to be examined in rodent learning studies , with particular importance in the ageing process .
 Chemical: Pregnenolone sulphate; Chemical: PREGS
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: Pregnenolone sulphate; Chemical: PREGS