11506
Considering the strong DNA minor groove binding observed for our previous series of diaromatic symmetric and asymmetric guanidinium and 2 - aminoimidazolinium derivatives , we report now the synthesis of new aminoalkyl derivatives of diaromatic guanidines with potential as DNA minor groove binders and antiprotozoal activity .
 Chemical: guanidinium; Chemical: 2 - aminoimidazolinium; Chemical: aminoalkyl
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: guanidinium; Chemical: 2 - aminoimidazolinium; Chemical: aminoalkyl