21520
Up to now , bismuth ( III ) complexes with thiosemicarbazones have been comparatively rare .
 Chemical: bismuth ( III ); Chemical: thiosemicarbazones
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: bismuth ( III ); Chemical: thiosemicarbazones