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Additionally , we found that the ester - and amide - linker modified MTX compounds had similar cytotoxicity but the dendrimer - ester MTX conjugates were much more cytotoxic than the dendrimer - amide MTX conjugates .
 Chemical: ester; Chemical: amide; Chemical: MTX; Chemical: ester; Chemical: MTX; Chemical: amide; Chemical: MTX
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: ester; Chemical: amide; Chemical: MTX; Chemical: ester; Chemical: MTX; Chemical: amide; Chemical: MTX