19814
Two new cyclic polyamine disulfides , based on hexa - and octa - amine inserts , were prepared and their transfection efficacies and cytotoxicities compared with our previously reported cyclic tri - and tetra - amine disulfides .
 Chemical: cyclic polyamine disulfides; Chemical: hexa - and octa - amine; Chemical: cyclic tri - and tetra - amine disulfides
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: cyclic polyamine disulfides; Chemical: hexa - and octa - amine; Chemical: cyclic tri - and tetra - amine disulfides