2198
This phencyclidine - induced impairment in cognition emerged in adult rats from week 7 on , and chronic , pre - symptomatic treatment of adolescent rats with CDPPB over weeks 5 - 6 ( 10 mg / kg per day ) prevented the appearance of SND deficits in adults until at least week 13 .
 Chemical: phencyclidine; Chemical: CDPPB
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: phencyclidine; Chemical: CDPPB