21052
In the present study a new method has been developed and validated for detecting free microcystins ( MCs ) ( MC - RR , MC - LR and MC - YR ) by liquid chromatography - mass spectrometry ( LC - MS ) in the cyprinid Tinca tinca and in the crayfish Procambarus clarkii collected from three ponds in Extremadura ( Spain ) where the presence of the cyanobacteria species Microcystis aeruginosa and Anabaena spiroides has been confirmed .
 Chemical: microcystins; Chemical: MC - RR; Chemical: MC - LR; Chemical: MC - YR
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: microcystins; Chemical: MC - RR; Chemical: MC - LR; Chemical: MC - YR