3357
Here , we examined the effect of FTY720 , its active metabolite , FTY720 - P , and sphingosine - 1 - phosphate ( S1P ) on neuronal viability using a classical in vitro model of excitotoxic neuronal death .
 Chemical: FTY720; Chemical: FTY720 - P; Chemical: sphingosine - 1 - phosphate; Chemical: S1P
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: FTY720; Chemical: FTY720 - P; Chemical: sphingosine - 1 - phosphate; Chemical: S1P