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The results show that , unlike PREGS , 11 - ketopregnenolone sulphate and epipregnanolone sulphate failed to block the effect of scopolamine , suggesting that altering the modulation of NMDA receptors diminishes the memory - enhancing effects of PREGS .
 Chemical: PREGS; Chemical: 11 - ketopregnenolone sulphate; Chemical: epipregnanolone sulphate; Chemical: scopolamine; Chemical: NMDA; 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: PREGS; Chemical: 11 - ketopregnenolone sulphate; Chemical: epipregnanolone sulphate; Chemical: scopolamine; Chemical: NMDA; Chemical: PREGS