5082
In the OGD model , P4 and VDH each showed neuroprotection individually , but combination of the " best " doses did not show substantial efficacy ; instead , the lower dose of VDH in combination with P4 was the most effective .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None