21720
Four further electronic transitions are reported between 215 and 180 nm ; it is proposed the negative maxima around 206 nm is either an n - sigma * transition or a charge transfer band resulting from the movement of charge from the pyrrolidyl N lone pair to the pyridyl pi * orbital .
 Chemical: pyrrolidyl; Chemical: N; Chemical: pyridyl
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: pyrrolidyl, N, pyridyl 
Answer:
 Chemical: pyrrolidyl; Chemical: N; Chemical: pyridyl