7701
Unlike previously reported 6 - methyl - 2 , 4 - disubstituted pyridazin - 3 ( 2H ) - ones , whose R - forms preferentially activated FPR1 / FPR2 , we found that four S - enantiomers in the seven ureidopropanamide pairs tested preferentially activated intracellular Ca ( 2 + ) flux in FPR2 - transfected cells , while the R - counterpart was more active in two enantiomer pairs .
 Chemical: 6 - methyl - 2 , 4 - disubstituted pyridazin - 3 ( 2H ) - ones; Chemical: ureidopropanamide; Chemical: Ca ( 2 + )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 6 - methyl - 2 , 4 - disubstituted pyridazin - 3 ( 2H ) - ones; Chemical: ureidopropanamide; Chemical: Ca ( 2 + )