15663
The compound 12a having exo - cyanoethylidene group in the 4 - position of piperidine ring was found to be two to threefold more potent than the linezolid against penicillin - resistant Staphylococcus pneumonia and Staphylococcus agalactiae , and also exhibited reduced MAO - B inhibitory activity .
 Chemical: exo - cyanoethylidene; Chemical: piperidine; Chemical: linezolid; Chemical: penicillin
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: exo - cyanoethylidene; Chemical: piperidine; Chemical: linezolid; Chemical: penicillin